I have a client that imports checks from a third party software.  They had to upgrade from QBDT 2018 to 2021 because of payroll and their IIF files would not import as they used to.  I used the "Import it for me. I'll fix it later." option instead of the blue "Import IIF" button, and it worked just like it did in the previous versions.  This particular client owns an antique mall and rents booth space to almost 100 vendors.  They collect the sales for all of them and then pay out their portion of the sales at the end of each month.  They were worried they would have to go back and manually enter those checks which would have been so time consuming.  I was so relieved when I could help them "fix" the problem and save them so much time.