iXpand Drive is full; unable to free up space in it

Hi having trouble with my SanDisk iXpand 64GB Flash Drive for iPhone. I have already copied files from iPhone to the flash drive and then from the flash drive to my Mac. Then I deleted files and folders on the ixpand drive using Mac. However, the drive keeps saying ‘64 GB used of 64 GB’ - so it’s saying it’s full. If I try and save a file I get a message saying ‘iExpand drive is full - operation could not be completed’ Yet when I go to VIew Files on the drive there are no files there. So what’s taking up the 64GB? I want to free up the 64 GB space in the ixpand drive so that I can copy more files on to it from my iPad. But how to free up the space in the flash drive?

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I had the same problem using a windows10 PC for Ixpand 3.0 the windows update tool did not work however I did save my original files including the Ixpand files. I reformatted my drive on my PC then returned the files I formerly saved IE the scandisk programs. when I connected to my iphone still showed full. I connected to my PC again clicked on the windows exec. tool in the flash drive and allowed the Private backup app to install and it updated the drive. I put it back on my phone, It still showed full I cleared the cache and Voila’ it was back to working properly. Repeated the process on 3 other drives with success. I felt that it was this type of problem because I have four, one that was a couple of years old the others less than a year, and they failed at the same time in November 2021. Due to the Holidays I put it off until I had allowed the warranty to expire. I don’t believe in coincidences and could not accept that four devices all failed at the same time. All four perform fine now.