Embedding invoices and LOA's is a tough task. If you have a gmail account I would create a google sheet, and download the google sheet app on your phone. Its free. You could also then save scans of and pictures of items into a gmail account.
If you want current values for your card collection, I would go VCP assuming you have a lot of vintage. The owner of VCP is on these threads normally. Market movers and Card Ladder are geared towards modern collectors and dramatically overvalue collections.
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