Questions

Hi, im new to urzagatherer and im looking to make my collection virtual, the only issue is I have somewhere in the ball park of 12,000 some odd cards. I found the scanner on the app is pretty slow so I decided to try Delver Lens, its scanner is fast and it has the option to export files as CSV's. I keep running into issues with the formatting and cant seem to get it to work. It says that the merging is complete but when I look theres nothing in the collection section where I assumed it would be. Any and all help with this issue is greatly appreciated!