Hey there!
I decided to make this post after spending nearly an HOUR having difficulties importing my bank transactions into Quickbooks Self-Employed. Hopefully this saves some of you any headaches. Here is what I did!
1. Make sure your bank is connected to Quickbooks
2. In the Transactions tab, go to the far middle right and download your transactions (you can search a smaller transaction so it is not a full list) it is the icon with the arrow going off the page.
3. Now that you have quickbooks format, delete everything in these columns (Bank, Account, Type, Category, Receipt, Notes) *do not delete the columns themselves, just the data inside of them
4. From here, manually copy and paste the correct Date, Description, and Amount information for the correct account.
5. Save as a CSV and upload!
Thats it! I know it is a little tedious, but it's the only way that has currently worked for me. Hopefully quickbooks can find an easier workaround in the near future!