Your comments

Apple cuts the download feature off from the app, so the app does not support downloading anymore.
I'm still trying to find another way to publish the full features app instead of AppStore. If it's ready, I will post it here and on the Better Tube app.
The ad-free add-on will be back soon, please wait.
Click the "i" button on the right side of a video, select "Share", you will see the email option.
Please try again:
Please take a screenshot for the videos that you can't play here, I will check it for you.
Apple does not allow downloading functionality, I have to compromise.
Wait for Apple to approve the version I just submit. Your videos will be back.
Thanks for your suggestion, I'm thinking about is there any workaround.
Do not delete the app, your videos are still on your device. I have submitted a version to recover the videos. It's now waiting for Apple review.