Installation and server related problems

Hi,

I'm trying to install h5p plugin into wordpress.

I follow instructions and activate my H5P plugin, but when I try to install content types, the hub dont pop. So I can't install any content types.

PHP 7.4

Wordpress 5.3.2

1. Detailed steps to reproduce the bug (exactly how and when did it happen) - when i selected some activity like interactive video
2. Platform and version number. E.g. Drupal, Wordpress, Moodle.

https://imgur.com/bwQgZB9

When importing an h5p file from another site I get an error message "Could not get posted H5P."

I suspect this may be to do with php upload limits as this is a new Wordpress installation on a new vps installation - but I've increased the php upload imits to 5M, which is beyond the 2.8M size of the file I'm trying to upoad and the initial error message about this issue has also gone.

However, a smaller file of 0.5M has uploaded without problem.

Any ideas?