All advice points to writing a tailored proposal that includes the client's name. How are we supposed to do that if we cannot see the name of the client until after the proposal is submitted? Do you need to pay for a membership to see this?
re: "How are we supposed to do that if we cannot see the name of the client until after the proposal is submitted?"
Upwork intentionally block freelancers from seeing the client's name or other contact information when you look at their job postings.
You do not need to address clients by name when you submit an initial proposal. I certainly don't.
re: "Do you need to pay for a membership to see this?"
A paid membership will not provide you with this information.
If the client has a history, most of the time the client's name will be mentioned in the feedback.
I think it's overkill to go out of your way to find out the client's name. If the client wanted you to know their name, they'd tell you in the job posting itself.
What's more, the name that is used in feedback is often inaccurate since it seems multiple people are authorised to use the same client account.
If the name isn't there in the job posting, then so be it.