Importing FBX Files into TB Harmony 10

I have already made my backgrounds in Maya, textures and lighting included, and I have already exported them into an FBX file. But when I tried importing it into Toon Boom Harmony 10, the whole computer would freeze and I had to end up restarting the computer.

I even tried decreasing the FBX’s file size to half, probably about 300MB and I still get the same result. Is there any solution to this problem?

I would highly recommend emailing support on this.