The PDF with the worksheets is a large file with many pages in addition to your return. The bank does not need all those extra worksheet pages which are for your records, not the bank. If the bank wants proof of efiling, you can select and print the page called "Electronic Postmark" and attach it to your basic return that you provide to the bank.
NOTE: I don't know how you are providing the info to the bank, but be aware it is not safe to email an unprotected tax return file in regular email, which is not a secure method of transmission. Tax return files have way too much sensitive info, including much of your personal ID info as well as possibly bank account numbers, etc.