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The best Steem front-end for desktops by far is Steempeak in my opinion and Esteem is also the best phone app to access Steem right now!

Videos on Dtube were stored for 3 months cause the cloud services costs a lot to maintain. Dtube also switched to test-net so no videos from back then are playable. Right now with the new changes dtube videos are stored for a year plus you can just copy the embed link of your youtube video and paste it to Dtube. It is a very fast and convinient way to post your videos on the Dtube platform.