Filetransfer to AddOn - how to? Deconz Addon

Hi community,

I would like to transfer flatfiles to be available for addons. In my specific case I would like to push OTA flatfiles to the DECONZ AddOn. Due to the homeassistant architecture of using Docker container I am a bit lost as there is no mount between home assistant file system and the Addon docker environment (at least I have not yet understood). Out of the deconz environment I cannot access anything outside.

How can I get a connection between lets say the share folder and the Addon? If that is too tricky, how can I transfer files from my local device to the docker instance of this deconz addon?

I am a bit lost. Thanks for supporting me