Hi @RazvanBuzatu
I recommend uploading to YouTube for now, which can store large video files. For YouTube thumbnails, use https://img.youtube.com/vi/[VIDEO ID]/0.jpg
For YouTube video embeds, use https://www.youtube.com/embeld/[ VIdeoID]
This will ensure your activities are not interrupted while waiting for updates from the appsheet team
Like this (Sampel App)