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Yes, I upload video but my upload easily

With no problems?

I used 3Speak (ThreeSpeak).

As I currently know, Ecency is also using that.

It has 5 GB (or something similar) file size limit.

Currently I do not know exactly. I have not used it since months.

Thanks for your advice, I suppose it's a matter of experimenting.

I always use Ecency to upload videos. It works perfectly for me.
My Blue Moon post has a video.

Interesting, gotta check!