I'm having this exact same problem

I attached all my videos from groove video and clicked "Save and Exit" When I came back a few minutes later, there are no videos attached in my membership. No matter how many times I save my work, once I exit, all video's disappear.

after leaving the comment below, I have created a new category and moved the 7 videos to the new category. Now I can see them and attach them to my groove membership. This should be corrected so we can have more than 10 video's in one category.

I am trying to add a groove video to my groove membership. I currently have 17 video's. It will only show me the first 10 video's and then the word "more". Clicking "More" allows be to see the same first 10 video's and not the additional 7. I copied the name of the video from the grove video page and pasted in the search bar in groove membership for the exact video I wanted and it can't seem to find the video. No preview appears in the video container.