I’ve deintegrated the SD card by following the instructions here: https://rcasupport.zendesk.com/hc/en-us/articles/360026267351-How-to-revert-my-SD-card-back-to-an-external-drive
On my phone the progress bar reached 100% but then gave an “out of space, please try again” warning. When I looked at the SD card status though it showed as empty and my picture storage seems to be working as normal now. I haven’t had to reinstall any apps as the article suggests.