I am evaluating your product. If it works, we will buy it and suggest our clients to buy it.

I am unable to write files in ext4 partitions.

The partition automounts when I insert my USB Stick or my SD Card.
I can read the partition.

When I drop a file on the partition, it appears in Windows file browser and I seem to be able to read it back.

The problem happens when I unmount the partition and remount it. At this point the files I copied are not there anymore.

I need a quick answer.