I used sort of workaround for this task:
I put small web-overlay on first page of folio with link to server file with decleared Manifest and list all nessesary files in Manifest-file.
Files are loaded to cashe and become available all over the folio even if the user is off-line.
If Manifest-file on server is changed, the files are reloaded.
There are some limitation of this workaround:
user should be on-line first time he opens folio,
i don't know will it work in Android viewers,
size of files shouldn't be big, as it cause a bit of delay of first page load