The document uploader rejects empty files. A filename can exist on your device even when the export or download did not produce any content.
Open the local file before retrying. Check its size in the device’s file manager and verify that the document actually displays its pages or data. If it is empty, download or export it again from the original source.
Do not rename the empty file or add text merely to make its size nonzero. The team needs the real document. If the source itself has no records for the requested period, explain that in the request or note and ask what evidence is appropriate.
Once you have a usable file, select it again and review the filename and size in Files to upload. The picker may allow choosing the same name after a failed selection, but make sure the new file contains the intended contents. Wait for the upload confirmation. If a nonempty valid file is still rejected, report its type, size, and exact error rather than sharing sensitive contents publicly.
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