As of now (September 2021), when a character is uploaded to the cloud, the first screenshot taken is always defaulted to for the thumbnail portrait of that character. Once uploaded, it is impossible to choose a different screenshot to be the thumbnail without loading the character, creating new screenshots, and reuploading. In addition, the screenshots are displayed in a seemingly arbitrary order, which also in unchangeable.

It would be nice to be able to choose different screenshots for the character portrait, as well as to be able to change the order that the screenshots are displayed in.