You can specify that a field is Any file (allows all file extensions), Document (only allows Office documents, PDF, etc) or Picture (allows all supported image formats).
If you want to specifically not allow HEIC files, we don’t provide that specific setting, since we can perfectly handle these types of files. Is there a specific reason not to allow HEIC files?
Note that in the 2024.2 release we have released HEIC/HEIF support, and these are internally converted to JPEG.