After I yesterday updated my mission Whole Lotta Altis with 90Mb mission file, first it timed out 2-3 times when trying to upload it. Finally it uploaded but after that no-one could download that mission in the scenarious where it says "download failed, try again". Then I could not re-upload the mission without time outs until today. Not I have 4Mb mission file uploaded, but still it refuses to download the mission in scenarios. I dont have the same problem with my other mission Whole Lotta Stratis. Even I couldnt upload it too yesterday, but its still downloads today. Using DEV-version of the game.
In the forum thread "Development branch discussion", someone was reporting the issue to happen with some else mission too, but didnt name it.