For small pieces of content, doable through the IIAB implementation of usb_lib and upload2usb. Content is also easily available to client machines that are connecting to the IIAB.
For less ephemeral learning bouquets (i.e., curated content), an implementor can customize their IIAB their specific content and then image/clone as needed.
Teachers / organizers being able to share their own content is a top-requested feature indeed. A few years ago, we implemented functionality similar to LibraryBox, to mount "teacher content" from USB sticks / drives and make it instantaneously available for students. More recently, after a teacher in the Yucatan requested it in November, we implemented functionality to enable students to be able to submit homework privately to their teacher OR share their summer photos (or any other content) akin to a traditional community bulletin board with their peers, i.e., Upload2USB. There's much more to be done, but the ability to share your own content and create community exchanges of information and ideas is central to Internet-in-a-Box's (IIAB)'s ethos.
https://news.ycombinator.com/item?id=43814433#43816392
For less ephemeral learning bouquets (i.e., curated content), an implementor can customize their IIAB their specific content and then image/clone as needed.
https://wiki.iiab.io/go/FAQ#How_do_I_customize_my_Internet-i...?