diff --git a/lib/Marlin/Marlin/src/gcode/gcode.h b/lib/Marlin/Marlin/src/gcode/gcode.h
index c23a4a1870..e3cecd7244 100644
--- a/lib/Marlin/Marlin/src/gcode/gcode.h
+++ b/lib/Marlin/Marlin/src/gcode/gcode.h
@@ -308,6 +308,13 @@
 
 enum AxisRelative : uint8_t { REL_X, REL_Y, REL_Z, REL_E, E_MODE_ABS, E_MODE_REL };
 
+#if ENABLED(SDSUPPORT) || ENABLED(SDCARD_GCODES)
+namespace M27_handler {
+  extern uint32_t sd_auto_report_delay;
+  void print_sd_status();
+} // namespace M27_handler
+#endif
+
 class GcodeSuite {
 public:
 
diff --git a/src/common/marlin_server.cpp b/src/common/marlin_server.cpp
index 81d234234d..bd836c18ba 100644
--- a/src/common/marlin_server.cpp
+++ b/src/common/marlin_server.cpp
@@ -543,6 +543,15 @@ void handle_nfc() {
 
 #endif
 
+void print_sd_report() {
+    static uint32_t last_sd_report = 0;
+    uint32_t current_time = ticks_s();
+    if (M27_handler::sd_auto_report_delay && (current_time - last_sd_report) >= M27_handler::sd_auto_report_delay) {
+        M27_handler::print_sd_status();
+        last_sd_report = current_time;
+    }
+}
+
 #if ENABLED(PRUSA_MMU2)
 /// Helper function that enqueues gcodes to safely unload filament from nozzle back to mmu
 ///
@@ -641,6 +650,10 @@ static void cycle() {
 
     print_fan_spd();
 
+#if ENABLED(SDSUPPORT) || ENABLED(SDCARD_GCODES)
+    print_sd_report();
+#endif
+
 #ifdef MINDA_BROKEN_CABLE_DETECTION
     print_Z_probe_cnt();
 #endif
diff --git a/src/common/media.cpp b/src/common/media.cpp
index 0abe30df25..55f25e18cf 100644
--- a/src/common/media.cpp
+++ b/src/common/media.cpp
@@ -320,7 +320,7 @@ void media_print_start() {
         media_print_size_estimate = media_print_file->get_gcode_stream_size_estimate();
 
         // Do not remove, needed for 3rd party tools such as octoprint to get status about the gcode file being opened
-        SERIAL_ECHOLNPAIR(MSG_SD_FILE_OPENED, marlin_vars()->media_SFN_path.get_ptr(), " Size:", media_print_size_estimate);
+        SERIAL_ECHOLNPAIR(MSG_SD_FILE_OPENED, marlin_vars()->media_SFN_path.get_ptr(), MSG_SD_SIZE, media_print_size_estimate);
 
         gcode_filter.reset();
         osSignalSet(prefetch_thread_id, PREFETCH_SIGNAL_START);
diff --git a/src/marlin_stubs/host/M115.cpp b/src/marlin_stubs/host/M115.cpp
index fcb4309146..6f36e62c2c 100644
--- a/src/marlin_stubs/host/M115.cpp
+++ b/src/marlin_stubs/host/M115.cpp
@@ -194,6 +194,9 @@ void GcodeSuite::M115() {
     #endif
     );
 
+    // EXTENDED_M20
+    cap_line(PSTR("EXTENDED_M20"), true);
+
     // THERMAL_PROTECTION
     cap_line(PSTR("THERMAL_PROTECTION")
     #if ((ENABLED(THERMAL_PROTECTION_HOTENDS) || HAS_DWARF()) && (ENABLED(THERMAL_PROTECTION_BED) || !HAS_HEATED_BED || HAS_MODULARBED()) && (ENABLED(THERMAL_PROTECTION_CHAMBER) || !HAS_HEATED_CHAMBER))
diff --git a/src/marlin_stubs/sdcard/M20-M30_M32-M34.cpp b/src/marlin_stubs/sdcard/M20-M30_M32-M34.cpp
index fa525bc45b..58a9fac166 100644
--- a/src/marlin_stubs/sdcard/M20-M30_M32-M34.cpp
+++ b/src/marlin_stubs/sdcard/M20-M30_M32-M34.cpp
@@ -5,6 +5,92 @@
 #include "media.hpp"
 #include "marlin_vars.hpp"
 
+struct ListControl {
+    bool print_lfn : 1;
+    bool print_time : 1;
+    uint8_t recursion_count;
+    time_t tz_offset_seconds;
+};
+
+// Forward reference (for recursion)
+static void list_files(const char *const dir_path, struct ListControl *lc);
+// Depends on stack size/RAM, etc
+// Set to 0 to disallow recursion, Marlin MAX is 6
+#define MAX_RECURSION_DEPTH 4
+// Device root name for FatFS
+#define ROOT_PREFIX "/usb"
+
+// Routine to output single dirent info in Marlin M20 format
+// Note: Use of 'alloca' prohibits inline
+static void __attribute__((noinline)) list_single_entry(const char *dir_path, struct dirent *entry, struct ListControl *lc) {
+    // Construct path to sub-dir.
+    int len = strlen(dir_path) + strlen(entry->d_name) + 2;
+    char *path = reinterpret_cast<char *>(alloca(len));
+    strcpy(path, dir_path);
+    strcat(path, "/");
+    strcat(path, entry->d_name);
+
+    if (entry->d_type != DT_DIR) {
+        struct stat fstats;
+
+        // Hide ROOT_PREFIX
+        SERIAL_ECHO(&path[sizeof(ROOT_PREFIX) - 1]);
+        int rc = stat(path, &fstats);
+        if (rc == 0) {
+            SERIAL_ECHOPAIR(PSTR(" "), fstats.st_size);
+            if (lc->print_time) {
+                struct tm lt;
+                time_t t = fstats.st_mtim.tv_sec + lc->tz_offset_seconds;
+                localtime_r(&t, &lt);
+                // M20 Date in high-word
+                t = ((lt.tm_year + 1900 - 1980) << 9 | (lt.tm_mon + 1) << 5 | lt.tm_mday) << 16;
+                // M20 Time in low-word
+                t |= lt.tm_hour << 11 | lt.tm_min << 5 | int((lt.tm_sec - (lt.tm_sec % 2)) / 2);
+                SERIAL_ECHOPGM(" 0x");
+                SERIAL_PRINT((unsigned int)t, HEX);
+            }
+            if (lc->print_lfn) {
+                SERIAL_ECHOPAIR(PSTR(" \""), entry->lfn, PSTR("\""));
+            }
+        }
+        SERIAL_EOL();
+    } else {
+        // Check recursion depth
+        if (lc->recursion_count == 0) {
+            return;
+        }
+
+        if (lc->print_lfn) {
+            SERIAL_ECHOPAIR(PSTR("DIR_ENTER: "), &path[sizeof(ROOT_PREFIX) - 1], PSTR("/ \""), entry->lfn, PSTR("\""));
+            SERIAL_EOL();
+        }
+        // List sub-directory calling 'list_files' recursively
+        lc->recursion_count--;
+        list_files(path, lc);
+        lc->recursion_count++;
+        if (lc->print_lfn) {
+            SERIAL_ECHOLNPGM("DIR_EXIT");
+        }
+    }
+    return;
+}
+
+// List all files in a single directory
+// Note that this function is called recursively
+static void list_files(const char *const dir_path, struct ListControl *lc) {
+    DIR *dir;
+    dir = opendir(dir_path);
+    if (dir != NULL) {
+        struct dirent *entry;
+        while ((entry = readdir(dir)) != NULL && entry->d_name[0]) {
+            // Output single directory entry or perform recursion into sub-dir
+            list_single_entry(dir_path, entry, lc);
+        }
+        closedir(dir);
+    }
+    return;
+}
+
 /** \addtogroup G-Codes
  * @{
  */
@@ -13,16 +99,18 @@
  * M20 - List SD card on serial port
  */
 void GcodeSuite::M20() {
-    SERIAL_ECHOLNPGM(MSG_BEGIN_FILE_LIST);
-    DIR *dir;
-    dir = opendir("/usb/");
-    if (dir != NULL) {
-        struct dirent *entry;
-        while ((entry = readdir(dir)) != NULL && entry->d_name[0]) {
-            SERIAL_ECHOLN(entry->d_name);
-        }
-        closedir(dir);
+    ListControl lc;
+    if (parser.seen('L')) {
+        lc.print_lfn = 1;
+    }
+    if (parser.seen('T')) {
+        lc.print_time = 1;
     }
+    // Get timezone offset to report local filetime
+    lc.tz_offset_seconds = time_tools::calculate_total_timezone_offset_minutes() * 60;
+    lc.recursion_count = MAX_RECURSION_DEPTH;
+    SERIAL_ECHOLNPGM(MSG_BEGIN_FILE_LIST);
+    list_files(ROOT_PREFIX, &lc);
     SERIAL_ECHOLNPGM(MSG_END_FILE_LIST);
 }
 
@@ -44,22 +132,42 @@ void GcodeSuite::M22() {
  * M23 - Select SD file
  */
 void GcodeSuite::M23() {
-    // Simplify3D includes the size, so zero out all spaces (#7227)
-    for (char *fn = parser.string_arg; *fn; ++fn) {
-        if (*fn == ' ') {
-            *fn = '\0';
-        }
+    char namebuf[marlin_vars()->media_SFN_path.max_length()];
+    // Simplify3D includes the size, terminate name at first space
+    char *idx = strchr(parser.string_arg, ' ');
+    if (idx) {
+        *idx = '\0';
     }
-    marlin_vars()->media_SFN_path.set(parser.string_arg);
+    // Need to prepend root device name
+    strcpy(namebuf, PSTR(ROOT_PREFIX));
+    strncpy(&namebuf[sizeof(ROOT_PREFIX) - 1], parser.string_arg, sizeof(namebuf) - sizeof(ROOT_PREFIX));
+
     // Do not remove. Used by third party tools to detect that a file has been selected
-    SERIAL_ECHOLNPGM(MSG_SD_FILE_SELECTED);
+    SERIAL_ECHO_START();
+    SERIAL_ECHOPAIR(PSTR("Now doing file: "), parser.string_arg);
+    SERIAL_EOL();
+
+    struct stat fstats;
+    int rc = stat(namebuf, &fstats);
+    if (rc == 0) {
+        marlin_vars()->media_SFN_path.set(namebuf);
+        // Do not remove, needed for 3rd party tools such as octoprint to get notification about the gcode file being opened
+        SERIAL_ECHOLNPAIR(MSG_SD_FILE_OPENED, parser.string_arg, MSG_SD_SIZE, fstats.st_size);
+        SERIAL_ECHOLNPGM(MSG_SD_FILE_SELECTED);
+    } else {
+        SERIAL_ECHOLNPAIR(MSG_SD_OPEN_FILE_FAIL, parser.string_arg);
+    }
 }
 
 /**
  * M24 - Start/resume SD print
  */
 void GcodeSuite::M24() {
-    marlin_server::print_resume();
+    if (media_print_get_state() == media_print_state_PAUSED) {
+        marlin_server::print_resume();
+    } else {
+        marlin_server::print_start(marlin_vars()->media_SFN_path.get_ptr(), marlin_server::PreviewSkipIfAble::all);
+    }
 }
 
 /**
@@ -89,19 +197,27 @@ void GcodeSuite::M26() {
  *
  * - `C` - Report current file's short file name instead
  */
+uint32_t M27_handler::sd_auto_report_delay = 0;
+
+void M27_handler::print_sd_status() {
+    if (media_print_get_state() != media_print_state_NONE) {
+        SERIAL_ECHOPGM(MSG_SD_PRINTING_BYTE);
+        SERIAL_ECHO(media_print_get_position());
+        SERIAL_CHAR('/');
+        SERIAL_ECHOLN(media_print_get_size());
+    } else {
+        SERIAL_ECHOLNPGM(MSG_SD_NOT_PRINTING);
+    }
+}
+
 void GcodeSuite::M27() {
     if (parser.seen('C')) {
         SERIAL_ECHOPGM("Current file: ");
         SERIAL_ECHOLN(marlin_vars()->media_SFN_path.get_ptr());
+    } else if (parser.seen('S')) {
+        M27_handler::sd_auto_report_delay = parser.byteval('S');
     } else {
-        if (media_print_get_state() != media_print_state_NONE) {
-            SERIAL_ECHOPGM(MSG_SD_PRINTING_BYTE);
-            SERIAL_ECHO(media_print_get_position());
-            SERIAL_CHAR('/');
-            SERIAL_ECHOLN(media_print_get_size());
-        } else {
-            SERIAL_ECHOLNPGM(MSG_SD_NOT_PRINTING);
-        }
+        M27_handler::print_sd_status();
     }
 }