FITS files cannot be saved unless you have RAW mode selected:
If you cannot find .FITS files, also check where the save directory location is by clicking “Sequence Options” in the Trigger Mode menu:
These settings are also available in the files area with additional options such as setting intervals between frames for easier download. To open the advanced menu, Click “Options” > ” Preferences” and select the “Auto Capture” tab:
If you are getting failed image sequences (files are missing in a sequence or the sequence stops), then adjust the camera USB download speed.