A user put together the guide I've attached for using flic buttons with MobileSheets. Let me know if that helps get you the information you are looking for. I have a couple flic buttons myself for testing and they work fine if configured as an HID so that they send key presses like "page down".
That's a lot of work. The new Flic buttons has Universal Actions. If i e.g. program Push as arrow-right, and Double push as arrow-left, you can connect the button to any BT device. in MSP just use the button to perform pedal actions like next-page and previous-page. You don't need the App for this anymore.
Did you set up the flic button as an HID? Did you pair it in the bluetooth settings (and make sure to try clearing the pairing and repairing)? If that's all fine, where exactly are you seeing a problem? If you go into Settings->Touch & Pedal Settings->Pedal Actions, tap the keys field for pedal 1, tap clear and press the button does anything show up?
The more information you provide, the easier it is for me (and others) to help you.
