The folks at Univ of Arkansas tried repeatedly but could not get the ZIM file installed.

Maybe we just need to explain this better? These 2 docs certainly aren't enough for now:
https://github.com/iiab/iiab-admin-console/blob/master/roles/console/files/help/InstContent.rst#manage-content ?
http://wiki.laptop.org/go/IIAB/FAQ#How_do_I_add_ZIM_files.2C_like_Wikipedia.3F

@tim-moody just clarified that:

• The USB stick must contain directories laid out as IIAB (can we clarify this requirement for Linux filesystems and also FAT, FAT32, exFAT and NTFS?)
• It seems a Linux-like filesystem (e.g. ext4) is recommended if possible, but might not be required?
• It seems it might in fact work on FAT/FAT32 if these 2 files are created?
  • E:\library\zims\content\RANDOM.zim
  • E:\library\zims\library.xml (Admin Console needs to create this one...a priori?)
• Can Admin Console -> Install Content -> Manage Content install the needed directories & library.xml file onto a FAT-or-similar USB stick? Does this need to happen at the very beginning?

Finally when this is well-understood, we should write up an actual/foolproof step-by-step sequence that less-technical implementers/teachers can follow to make this happen-

Ref: #828 (comment) #857