How much experience do you have with Exploded Assembly configurations?
How much experience do you have with Animation timeline?
Is this a school project?
Create an assembly of two parts.
Create the Exploded Assembly.
Go to Animation timeline and set a part to Fade.
Attach your attempt here.
I have 6 years of experience in solidworks assembly but did not try animation.
It will be more helpful if you can attach some steps using screen shots or video As I have already made a video but using option "Animate collapse" in exploded view but I want every part to appear and then get assemble but right now in current video I have all the parts visible in exploded condition and getting assembled.