by the way: that image shows that you're using a 128G stick, not a 256G stick.
meanwhile the Sandisk Ultra Eco 256G version has arrived over here for testing (https://www.amazon.nl/dp/B0B8X7DX8D)
- the 256G version works right out of the box : no problems here -> so the PROFILER can handle at least this 'modern' big stick without problems , and there is not per se a structural problem with big sticks
- formatting this 256G stick like Bistro79 did, simply with the default settings of Windows will result in a unsupported format stick (exFAT)
- when inserted into the PROFILER this way the PROFILER will ask to confirm formatting (there is a pop-up dialog which asks 'Are you sure? - USB stick needs to be formatted' --> so this is as intended, because the PROFILER can't recognize exFAT
- when pressing 'yes' to format it takes aaaages to complete, and there isn't much UI feedback to the user : about 6.5 minutes (so this could be improved on PROFILER's side; it looks like the PROFILER is hung-up; after the formatting is done the only indication that it succeeded is that the tap blinkin commences.. the user has to press 'exit' before continuing)
- after the stick has successfully been formatted by the PROFILER everything works fine : the stick has it's full capacity of 256G
- If you really want to format the stick on a Windows machine for use with the PROFILER you'll be needing a 3th party tool (tested for example with 'guiformat.exe by Ridgecrop Consultants' ) -> be sure to format as FAT32LBA and the PROFILER will accept the stick.
conclusion:
a) at least this Sandisk Ultra Ecu 256G works as it should: no problems over here - another stick which does work fine!
b) do not bother to format the stick yourself: just use a USB stick right out of the box