Practical steps
- Check the file type, size, and dimensions against the limits shown by the upload field. Keep a local original; changing an extension does not convert a file.
- Wait for upload and confirmation to finish before submitting. If the session expires, sign in again and check what was saved before uploading again or creating another draft.
- If it keeps failing, send the file type and size, browser, steps, and error to workspace support. Remove tokens, temporary URLs, and personal details from screenshots.