Hi,
But you can adjust the memory WordPress inside the wp-config.php file
Change your WordPress memory to 128M or a maximum 256M if it’s not over your PHP shared memory.
Also check the official documentation from WordPress in the link below.
https://codex.wordpress.org/Editing_wp-config.php#Increasing_memory_allocated_to_PHP
Try to import after that, probably you will have to refresh the import page after receiving any error. You will get the message “It’s done.Have fun”
The import of the images take sometime and if the server has restriction this situations can happen.
Let us know how it goes.
-Rui