Melissa You should not need to download files nor use any sort of other alternative. Brightspace can be set up with LTI so that it can be synced with ADAPT, then ADAPT can serve your students the assignments in ADAPT, grade them, and return the grades directly to Brightspace. There is a video here:
https://commons.libretexts.org/insight/coupling-adapt-courses-to-d2l-via-lti-only
If you need help with getting your institution to use ADAPT via LTI, then have your institution contact us. They have to fill out the form at: https://adapt.libretexts.org/lti/brightspace/config/cuny-brooklyn (it can be fast or slow depending on your campus). We highly recommend going through ADAPT to grade H5P instead of exporting/importing because ADAPT allows for the use of student-by-student delivery of accessible alternatives for any H5P that may not be fully accessible.