Our engineers have discovered the issue, specifically around the newest version of Chrome, and are working on a fix!
If you're having problems uploading pictures using the mobile version of the site (not the app) and are also using a different browser than Chrome, please let us know which...
Are you using the app or the mobile version of the site on your browser?
Which phone / OS are you using?
If you tried with the browser, did it work? If not, which browser are you using?