The "Bring your train to an easy stop..." message is a generic Error Message that is displayed for anything on the forum that generates an error. I thought it was a better way to say that than the forum-supplied, generic wording of "ERROR." Under that message, in smaller type, will be the reason for the error. What did that say?
I hope your statement that, "...the Forum does not want me to attach short videos..." is said in jest. No one here watches the videos before they are posted in order to "approve" them. It is a totally automated process.
I just did a video post in my testing forum with a video file that is 99.98 megabytes. It is purposely saved at that size so it is very close to the 100 MB limit. It uploaded and displayed just fine. Either your video file is larger than you think it is, or you need to try another browser to upload. The problem is not on this end.
