Cannot import .tco file

I am developing a substantial update to our site on a development clone. I need to import a Cornerstone page that has been updated on production into the development site. I exported the page from production and saved it as a .tco file. When I try to drag and drop into Cornerstone or if I try to import into the page I get several errors that I was able to screen shot (they disappear quickly and I don’t see that they are logged).

The errors state:
“Sorry you are not allowed to upload this file type” Followed by a long hexadecimal string.
“Failed to import image batch. Your server upload limit is probably preventing this upload from happening”

The PHP upload_max_filesize is set to 1G. The largest image file is around 4.7mb (4745kb).

Hello Kevin,

Thanks for writing in! Your server may have disallowed .tco file type. Please also check your Tools > Site Health > Status for any performance issues. We would also love to check your site if we can log in. You can create a secure note in your next reply with the following info:
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image

Cheers.

It was probably never explicitly allowed as I believe it uses the default set for Apache/nginx and .tco is custom. What is the .tco MIME type? I can try to add it to the server once I’m back in the office on Wednesday. If that doesn’t work I can give you access to the dev server.