Choose at least one file to upload means the form has no accepted file in its current selection. Typing a note or choosing a category does not attach a document.
Use Choose files or drag a supported file into the form. Look for its filename and size under Files to upload. If it does not appear, read the rejection message for a size, type, empty-file, or filename-length issue.
Check whether the form changed context after you selected the file. Switching company, request, or account can reset the selection so a file is not accidentally sent under a different scope.
For a request, use its own upload action and prepare the one file it accepts. For a general batch, review every selected file before submitting. Wait for receipt confirmation afterward; the visible selection is still only local preparation. If the picker repeatedly returns no file, try the normal browse control and verify the document exists on the device. A cloud shortcut may need to be downloaded before the browser can read its contents.
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