Hope your all well

I'm struggling to import a basic Joomla content import, due to restrictions set in Akeeba Admin Tool .htaccess & wonder whether you could help at all - or seen this before?
At the last stage of importing a file, I get a 403 error.
Initially, I thought my hosting provider had some security restriction. They checked and pointed me towards the .htaccess.
See screenshots.
If I disable Server > Back End Protection , I can import as normal.
So do you know what I can add to the "Backend directories where file type exceptions are allowed" or "Backend file types allowed in selected directories" to allow the imprt to run AND allow me to leave Server > Back End Protection enabled
Thanks in advance
Andy