On Android operating systems, the directory holding game data is accessible if the device is rooted or if the user employs file navigation tools. A "save file download" in this context works by:

This is the most common platform for manual save manipulation because Android grants file access.

Upload the folder to Google Drive as a ZIP file (to preserve folder structure).

Open LDOE → Settings → "Save to Cloud" (This is not a full save; it only saves your progress point). Then, manually copy the entire zombie.survival.craft.z folder to your PC.