There is a method for clearing the Companion app cache from within the app but shouldn’t there be an HA action to accomplish this? My main dashboard page has an image embedded that changes seasonally. I have an automation that changes the appropriate image file when triggered. The problem is the Companion cache holds the old image. I would like to be able to clear cache from that automation by using an action. Restarting HA has been suggested as a fix and I am trying that but it’s 3 months until summer.
Use different file names for each season.
Does your Companion app run on the phone or your HomeAssistant server? Examine where your cache is loaded and go from there to clear it.