1. Confirm that the file size does not exceed the maximum allowed limit (5MB or less).
2. Ensure the file name does not contain special characters (e.g. #, %, &, /).
3. If the file size is large, compress the document and attempt the upload again.
4. If an error message is displayed, take a clear screenshot of the error.
for further assistance.
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For best results, please ensure to keep uploaded files as small as possible and clearly named.