1. Turn on Screen Lock and Incognito Keyboards so that your sessions are just yours an not anyone else.
Removing the compromise option is the goal here.
#Signal Messenger is a messaging client just like any others, automatic downloading of video and audio are a big no no, unless you actually have AV and Malware STIGS in place
Always ensure you manually chose what files are downloaded to your device.
#Signal actually is prepared for the Regulatory Compliance market was it maintains #COOP and #DRP options.
By ensuring an encrypted backup is done you don't have to "icloud" your privacy away.
The Emergency Action Plan
If there are extreme delays or a reason why you want to shift between the Signal App and another client (if Signal is Primary) here's the mechanical shift so to speak.
And last but not least the Dissapearing Message option for those who like to talk securely, but you still don't necessarily trust the other party and would like to keep evidence out of the options window.