Thanks, yes I understand. Just to clarify the situation: in the INDI control panel the driver is configured to use "native" transport, and when I capture a preview image in the Ekos CCD tab it successfully downloads an image and loads it in the FITS previewer. However, when I switch over to the plate solving tab and click capture and solve, for some reason the driver is ignoring the native setting and attempting to use FITS transport. I can generate the same failure to open /tmp/indi_*** error if I switch the transport to FITS in the control panel and then try to capture a preview in the CCD tab. I'm not sure why the setting is missed, will try to debug this flow.Yes, happy to share once I verify I can get an image. I do see that if I switch to my ZWO camera and just snap some images indoors then the solver is running (but triggering the mmap failures). If I take the scope outside and snap some frames, do you expect that the solver will run ok even if some index files fail to load?