Alfred - I have the exact same issue.
I followed through the steps you outlined but here’s the issue:
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When copying files from a separate drive onto the SanDisk UFD, the “cannot open file for write…” error (that others noted) pops up.
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So, I go back to the “SanDiskSecureAccessV2.0” folder and right click it to uncheck the “Read Only” option
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I restart copying the files onto SanDisk UFD through the vault. However, in a few seconds I get the above error again.
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It seems the app automatically makes the “SanDiskSecureAccessV2.0” folder read only.
This is really frustrating and I am considering to return the drive if the issue is not fixed.
Please help!
STC