To modify your files, please follow these steps:
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Find the document you intend to modify.
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Swipe left, and you will see "Rename," "Move," "Merge," and "Delete."
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Tap "Delete" to delete the file. Or tap "Move" to move it to the folder you create.
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Alternatively, tap "Rename" to rename the file.
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Or, select two or more files to merge them into one.
To restore deleted files, please follow these steps:
1. Tap the icon 
in the top right of the "Files" page.
2. Tap "Trash".
3. Select the file you want to restore and click "Restore" on the bottom.