There's a downloader app https://play.google.com/store/apps/details?id=com.esaba.downloader

I use this one https://play.google.com/store/apps/details?id=flar2.homebutton&hl=en_US&referrer=utm_source%3Dgoogle%26utm_medium%3Dorganic%26utm_term%3Dbutton+remapper&pcampaignid=APPU_1_hfvkZqCRO5L00PEPndHYyQQ

Install a button remapper You can disable the buttons, or reuse them for custom actions :P

I don't think lemmy supports blocking instances (only users and communities)

However boost can mute instances (as well as users and communities)

I'm not sure what the difference is. But I think it's that boost will not show thing from your feed based on the mute list

Whereas setting something as blocked will prevent the lemmy servers from ever serving that community in your feed.