Can I import an existing template from Joomla or Artisteer?

Good day, I have a website on Joomla 3 and I have a template created in Artisteer. I would like to ask if it is possible to use Nicepage to convert it to a Joomla 4 compatible template? I have...

Why are the files so big when exported to zip file? I am also an Artisteer user, can these be brought into Artisteer to reduce the file size as AWS EC2 will not support a large file like NicePage