Can I scan to OCR and search receipts with a personal account in Dropbox?

For reasons I won't waste time discussing, I have not been happy with Shoeboxed or Google Drive for storing receipts. I have a Dropbox account that I don't use for much and I wonder if it would suit my needs:

I'd like to scan receipts, using my phone camera, and be able to search for Store names and amounts listed on the receipts. I have read that Dropbox will do the OCR, at least if you scan the original from their mobile app (I already have lots of receipts in pdf but it appears that Dropbox will not OCR those). But I've just run several tests and it does not seem to work. By that, I mean that I get no search results when I search for an amount, e.g. 6.50 or "6.50" or a store name.

Can anyone confirm that I can scan to an OCR'd pdf and, if so, what might I be doing wrong? Thanks, this is actually a pretty big deal for me, as I have been trying for years to get a really reliable e-filing system for receipts.