Hello @ShawnJensen2025 ...
EDIT: I just re-read your question, and I should also ask... are you trying to import a course from Canvas Commons? Or, are you importing a course that isn't yours but you have the file for it to import into your own FFT course? If you are trying to import a course from Commons, it may be over the 500 MB limit for FFT courses (as described below).
I am assuming that you are trying to import a file that you've exported from one course and then import that file into your FFT course. Am I correct in this assumption? If so, how large of a file is it that you are trying to import? FFT courses are limited to 500 MB of course storage space, and this cannot be changed. See this document for more details:
Canvas Free for Teacher Account Comparison | Instructure
If your file is over 500 MB, you're going to need to reduce the file size so that it can be imported. If you have a *.imscc file, you can change the file extension to a *.zip file. Then, unzip the file. You'll find a bunch of files and folders in the unzipped folder structure. If you can find a way to remove some of those files, you can then zip up the folders just like it was originally, and then change the file extension from *.zip to *.imscc. This is detailed a bit in: How do I export a Canvas course? - Instructure Community - 785.
Your other option would be to try and eliminate content in the original course first, export the course to an *.imscc file where it would hopfully be less than 500 MB, and then try to import that course export file to your FFT course.
I hope this will help a bit. Sing out if you have other questions/concerns.
Take care...be well.