If you download them to a site like YouTube then share link then anyone can watch if you don't have set to private.
If just take video on phone and share straight here then some can view it or some just get a spinning circle forever.
Then like however you shared it,for me I got to press download and wait few minutes then can watch it in my downloads.
But yeah alot have trouble with videos on r2r,owner/s aware of it and is talk of making an app and hopefully making videos more easier.
But I just download to youtube and keep all my videos there so no big deal really