[Q] Titanium Backup no allowing to use OTG Flash Drive as Backup Destination

On my Nexus 6 I have a Flash Drive connected via OTG, I am using StickMount to mount it in the file system, I can use it without any problem from TWRP, RootExplorer, Media Players, etc. The Flash drive is formatted using FAT32. When I try to configure Titanium Backup to use it as the destination folder for backup, I can get to the folder where the drive is mounted but the option "Use the current folder" is dimmed and I cannot press it to select the folder, please any help or guidance will be appreciated, thanks

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