It seems this function is removed in LR mobile 3.1.10 ... where did it go & how can I create a clip based on a LR collection please ?
Tap the Share icon in the top-right corner, and then tap Create a Video in Clip. (Alternatively, you can tap on “…” next to the collection that you’d like to use for your project in the Organize view. Then tap on Create a Video in Clip.)
Seems like it was removed in 2.8.
The workaround is to go to Clip and select your photos in there... even if it it slower.
Here is a thread regarding it, plus you can create another 'Idea' in the same forum as a feature request to try to get it back.