Good luck with the hold. If I recall, several times in years past I have seen the CC Hold option in the mobile app after the import scan where they wanted me to pay, but in the web interface it gave me the hold at not charge. And it was in the web interface I made this change several days ago, while the phone was still in ZZ.
Strange that mobile app would only offer "UPS stores", and didn't offer the UPS Customer Center, but the Safari web interface on my MBP did.
And here is the info I currently have regarding the CC pickup:
View attachment 2064023
And here is my 2020 notification from UPS on the morning of delivery confirming the pickup location:
View attachment 2064012