For reply to the original issue: I believe people are trying to upload invalid filetypes, such as that QB data file is not a Tax Format nor a document and not a pdf file. That's when the spinner just keeps spinning. This is not a DropBox-like tool. I haven't been able to find a "valid filetypes" reference list, though. For scanning, a resolution of 300dpi is fine; more than this creates large files. I have a photo-quality scanner that will go ridiculously high; the new iPhone HEIC format seems to be a similar issue.