I had the same issue from Twitter on iOS. Deleted the app, rebooted phone, reinstalled app and all the share buttons incl Evernote are back. BUT, no matter what I do, whether direct from Twitter or then opening in safari, the Evernote share button won’t load a Google sheet that I want to clip. All I get is the a blank white pop up with the Evernote logo that just sits there and then disappears without letting me do anything. Seems to work as usual with webpages etc