Please, help us!!! FCPX 10.4

We work on the television channel. Recently we got Sony A7s camera.

We work on laptops MacBook Pro. Previously, we used the operating system Sierra and everything was fine.

But after we made the update of High Sierra, we had a problem!!!

We can not import a video file from a flach card into the FCPX program.

We can import files from the camera, but they do not have sound.

This problem is only for files that are shot in AVCHD format.

But we can shoot only in this format. Because only this format allows you to shoot in interlace. We can use only interlace, because we are working on a television channel.

We really hoped to update 10.4 for FCPX, but it did not help us !!! Why did not you support for AVCHD?!