Playlist insertation does not work, no gallery is produced

Hello, I opened the field “Search for a video, a channel playlist, or a channel gallery to insert.” and marked the field “A channel as a playlist or galleryv10.3+- Enter a link to any video that belongs to the user channel. ”

Then I tried to insert the Playlist Link, but the gallery wont work. I always get an error like this:

“Sorry, that does not seem to be a link to an existing video. Please confirm that the link works in your browser, and then copy that full link in your address bar to paste here.”

Now the thing is, I want to generate a gallery out of a playlist not a channel. I do not have a channel where I upload my own videos. So how may I generate a gallery out of my personal Playlist?

Thank You

https://www.ads-software.com/plugins/youtube-channel-gallery/