The file synchronization got stuck at 99%, and one item failed to sync. After I shortened the file name, it was able to sync again.
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The maximum filename length depends on a few factors including the filesystem and language.
Android typically overlays a FAT32 filesystem for the internal storage and formats external SD card storage as FAT32. So a general rule of thumb is 255 bytes (note, not characters).
Depending on the language encoding, each character requires 1 to 4 bytes, so the filename limit can be as short as 63 or as much as 255.
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