Works some of the time, not with Sierra

Using Poster to upload to Smugmug. Getting errors today on random photos from the same camera roll, "The data couldn’t be read because it isn’t in the correct format.”

No idea why, but I keep starting the upload again and it is hammering through.

Update: Doesn’t work with Sierra. Can;t get the upload screen to show with SmugMug. Logs in select account, no app launches.

Update 2: Worked after newest patch…once. Uploaded 375 photos to SmugMug, then tried to upload 230 more and the app doesn’t launch. Restarted, same result. Back to the drawing board.

GenXrguy about Poster, v1.6.3