EDIT: The problem was the map resoultion. The original image was 10k*10k, when I reduced it to 5k it works.

Hello,

What are the supported file formats/specs to use with HightField File node? I tried .tiff (geotiff), .jpg, bmp and couple others but none of them work.

Thanks.

I just found out that the problem is not the file format but the actual files I'm using. Is there a size limit for the files? because when using smaller files, it works fine.

I dont know if this might be solving the issue but its worth a try:
Under: Preferences -> Compositing -> Cooking ->

Set the Resolution Limit higher than 10000x10000