diff --git a/backend/file_management/file_management_helper.py b/backend/file_management/file_management_helper.py
index ab56c4dba5..008368d09d 100644
--- a/backend/file_management/file_management_helper.py
+++ b/backend/file_management/file_management_helper.py
@@ -81,9 +81,18 @@ def get_files(fs: AbstractFileSystem, file_path: str) -> list[FileInformation]:
             if os.path.normpath(file_path) == os.path.normpath(file_name):
                 continue
 
-            # Call fs.info() to get file size if its missing
+            # Google-native docs (Docs/Sheets/Slides) carry no fileSize, so pydrive2's
+            # info() raises on int(None); fall back to 0 (display-only) to keep listing.
             if file_info.get("type") == "file" and file_info.get("size") is None:
-                file_info = fs.info(file_name)
+                try:
+                    file_info = fs.info(file_name)
+                except Exception as exc:
+                    logger.warning(
+                        "fs.info() failed for %s; using ls() metadata: %s",
+                        file_name,
+                        exc,
+                    )
+                    file_info["size"] = 0
 
             file_content_type = file_info.get("ContentType")
             if not file_content_type:
diff --git a/frontend/src/components/input-output/file-system/FileSystem.jsx b/frontend/src/components/input-output/file-system/FileSystem.jsx
index 2ce90ef485..3380abcde9 100644
--- a/frontend/src/components/input-output/file-system/FileSystem.jsx
+++ b/frontend/src/components/input-output/file-system/FileSystem.jsx
@@ -204,7 +204,8 @@ function transformTree(tree) {
     title = key.split("/").at(-1);
     isFile = node.type === "file";
     modifiedDate = node.modified_at?.split(" ")[0] || "";
-    size = isFile ? formatBytes(node.size) : "";
+    // Blank when size is 0/unknown (e.g. Google-native docs) instead of "0 B".
+    size = isFile && node.size ? formatBytes(node.size) : "";
 
     node["key"] = key;
     node["icon"] = isFile ? <Document /> : <Folder />;