Site Library gets stuck on "Importing Content"

Hi there,

I can not get the Site Library feature to successfully import the demo content from any of the templates available. It always gets stuck on the "Importing Content" step and never finishes no matter how long I leave it. I've tried deactivating all plugins other than GeneratePress Premium and GenerateBlocks. I also have changed the server settings to the recommended:

upload_max_filesize (256M)
max_input_time (300)
memory_limit (256M)
max_execution_time (300)
post_max_size (512M)

and I can see the above changes reflected in the site health > server section so I believe they are working. I did notice in my site health the following messages:

Warning The optional module, dom, is not installed, or has been disabled.
Warning The optional module, fileinfo, is not installed, or has been disabled.
Warning The optional module, imagick, is not installed, or has been disabled.
Warning The optional module, mbstring, is not installed, or has been disabled.
Warning The optional module, zip, is not installed, or has been disabled.
Error The required module, gd, is not installed, or has been disabled.
Warning The optional module, intl, is not installed, or has been disabled.

Could these affect the import?

I enabled the debug.log and ran the import again. Here is a link to the data in the debug.log file:
https://pastebin.com/1fNHnNPs

Any help would be greatly appreciated.

Thanks,
Andy