In H5P, there are options to allow the activity owner to add other individuals to help create content. From the dashboard of the content type, there will be collaboration options located at the bottom of the page before you save.

1.  On an H5P content assignment, select Edit on the top left.

2. Navigate down the page until you see the additional options displayed on the bottom left. Select Collaborators to begin adding in users.

3. Under the "Choose who can edit content" text, type in the users that you want to add to work together on an activity.