I installed the h5p module on D8. I added a paragraph type with an H5P field. I made that paragraph type available to the basic page content type (which already had a paragraphs field). When editing a basic page and adding an h5p paragraph I don't see the usual button to upload the file. I do see a file chooser and I am able to choose a file and see it selected but there is no upload button visible to let me confirm it. When I save the page the selected file is not saved in the h5p field.
I guess I am missing a step but I don't see anything obvious from the documentation on the h5p.org site.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
At least in Drupal 11 with the 2.0.0-alpha6 module, I don't think the missing upload button is the problem. The core Image field widget has a similar UI -- a file picker with no upload button. That said, there are other issue using this widget (see https://www.drupal.org/project/h5p/issues/3309418 → ), and with Drupal 11 it generates a WSOD because the file_validate_extensions plugin was deprecated in D10.