Hey @Geoff3 ,
I am still not entirely sure what is happening here ( I have been testing as many drives and formats as I can on my end here but they all appear to be working fine so I think maybe we are having some freak issue or something here) but I think the next step would be to get an exhaustive email from you to support@sleepycircuits.com with the following info in one place:
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The power supply model you are using with your kit and its rated current output.
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A phone video following the cables and showing the screen what happens when you plug in a capture card, please make certain to follow in the vid how youre powering the Hypno since lack of current can make USB devices malfunction.
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Model info of used capture card (USB version, model number, manufacturer etc.)
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model of your usb drive (USB version, model number, manufacturer etc.)
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last firmware version number where your usb drive was working (so I can see if anything has changed since then) and plz confirm if rolling back to this firmware revision makes your USB drive work again.
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Confirmation of the method of formatting the fat32 drive (plz use the utility mentioned above) and the flashing OS (Win/Mac)
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A screen cap of the directory structure of the FAT32 drive youre plugging in (please use the cube1.mp4 and nothing else, it will not enable the teal shape if there is no valid file present on the drive)
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a phone vid following all cables and hardware setup when plugging in the drive including if the screen does anything when the drive is plugged in (once again please make sure to follow where the power is coming from.)
If you are seeing the teal shape and bars that means that you are receiving a feed from your capture card, the connection seems unstable so I would recommend trying to add a second psu plugged into your microusb as well as the usb-c port on the pi3 Hypno. This would indicate that your usb ports are working fine but for some reason cant get a stable connection. If screen returns to an all pink screen means that the device has disconnected and Hypno auto switched back to the sin shape, it appears to be bouncing back between the connected and disconnected state.
Please also see: List of USB Accessories that work with Hypno in case it offers any clues to you as to what may be going wrong, theres a lot of good usb device specs in there.
Anyway if all else fails and your order is domestic its no big deal to have you send the unit for me to verify physically, we can figure out details over email and hopefully we can get this sorted for ya soon!