Welcome to this tutorial where I will show something you'll be able to quickly do yourself.
I'm certain there will be a way to preupload videos to dTube and release them at a later time. Meanwhile I have a solution with a little bit of copy and pasting for you.
Go to the upload form and upload video and snapshot as you usually would do.
Now go to the bottom and unfold the Advanced (1.) section. There will be 4 hashes (2.) you can copy and save in notes or wherever you like.
Now you can leave and travel and whenever you want to release the post you just have to go back to your upload form, expand the advanced menu and fill these values back in.
This does not replace a proper unlist or private mode. The video will be accessible for everyone. If you really don't want anyone to see your videos before you publish them you might want to setup your own IPFS-node where you can control when to release files.
Hope that helped.
