How do I delete watch latter videos all at once or do I have to do it one by one

First, I'm not an Apple Tech.
Try; https://www.youtube.com/watch?v=kYy-5g9WFPI

(He's long winded, but informative. it starts at 1:34); https://www.youtube.com/watch?v=kYy-5g9WFPI

Aloha, ukeboy57

1. Tap on Setting > iCloud > Storage. Then tap on Manage Storage.
2. And then tap on This iPad.
3. Under the Backup options, you will see Photo Library option, set the slider to OFF position.
4. Tap on Turn off & Delete to delete all photos and videos from iCloud.

After deleting existing photos and videos, you can either set the Photo Library back to ON position and start backing up new photos to iCloud or keep it OFF and use Photo Stream. You can store up to 1,000 images on Photo Stream for free and download them to your computer. These images will remain in Photo Stream for 30 days, after which they will be deleted.

How to Fix Not Enough Storage on iCloud for Your iPhone iPad

To delete a single image, summon the image on the screen and touch the Trash icon that appears in the upper-right corner. Choose the Confirm Delete command. The image is gone.
Deleting a video isn't as easy as removing an image: You have to long-press the video thumbnail in an album. The long-press activates multiple-selection mode. For removing a video, however, just touch the Trash icon that appears in the upper-right corner of the screen. Choose the Confirm Delete command, and the video is gone.
You can't undelete an image or a video you've deleted. There's no way to recover such an image using available tools on the Galaxy Tab.
You can apply the Delete command to an entire swath of items in the gallery at once. To do so, you must know the secret, found below:

1. Open the album (pile) you want to mess with.
2. Long-press an image to select it. Instantly, you activate image-selection mode.
   

1. Continue touching images and videos to select them.Or you can choose the Select All command.
2. Perform an action on the group of images or videos.

To deselect items, touch them again. To deselect everything, touch the Done command.
The type of commands you can use on a group of items in an album depends on the group. Some commands, such as Delete and Share, can be performed on any old group. Other commands, such as the image rotation commands, work only with pictures, not with videos.

Depends on what you mean by download. If you are saving a video to your computer the speed is totally reliant on your computer and your connection speed. Wireless connections are commonly slower than wired. If you are talking about watching a video (streaming) then in addition to the above factors is the connection between the source (such as YouTube) and your Internet Service Provider (Time-Warner, Verizon, etc.) See the link below for an explanation of the latter issue and a tool to check the Video Quality from your ISP. (Google owns YouTube).
Dont Blame Us for Slow YouTube Videos Says Google
However, don't be too hasty to accept Google's blaming of the ISP. If you are interested in the full story see this link:
Why YouTube buffers The secret deals that makeand breakonline video or Google slow video peering

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

What kind of tablet or ereader do you use?

• If it's an android based device, you can simply connect it to your computer and run a video recovery program on it. Give this app a try if you're a Mac user. http://www.leawo.org/photo-recovery-mac/
• If you're on an iPad, then you can recover deleted videos from iTunes or iCloud backup. Here's also a related guide for you. http://www.leawo.org/tutorial/undelete-ipad-mini-video-how-to-recover-deleted-videos-from-ipad-mini-backup.html
• If you've nevered backed them up, I'm sorry to say that the lost videos are gone forever.

Please watch this video that it will show you how to hard reset your tablet. This will set the tablet as brand new, have inmind that it will delete all your data. The combination button for the recovery mode that you watch in the video is power and volume down rocker. Just do exactly as the video.

https://www.youtube.com/watch?v=rc5Ije_54Tc

Without knowing the exact model and Android version, it's a bit more difficult to help.

I personally downloaded flash player for my version of android which I was able to find through google, and then installed Dolphin browser for Android. Then in the settings for Dolphin browser, go to 'web content' and then set flash to either 'always on' or 'on demand'.

Barring that, you may find this link
Awesome Trick To Play Watch Facebook Videos On Android Phones And Tablets... a little easier to follow.

Good luck.

You can try GT Recovery for Windows!
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With this way you can recover deleted contacts on any brands of Android device such as Samsung, HTC, Huawei, Sony, Motorola, Lenovo, LG, Sharp, etc.
Thank you for watching share and comment thank you.

Hello, I am sorry to say that once you delete a video it is gone forever, you cant get it back.