upgrade memory on my M1 macbook pro

No, but why do you ask?

It's very easy to determine if your Mac's performance is being limited by available memory. Please read Check if your Mac needs more RAM in Activity Monitor - Apple Support. If the "Memory Pressure" graph is frequently "red" your Mac would benefit from additional memory. If not, it won't. It's that simple.

the last MacBook Pro with upgradeable memory was a 2012 model. Since then, MacBook RAM chips have been soldered down for maximum reliability.

To obtain a computer with larger RAM, you would need to convert your current computer to CASH (by selling it) and obtain different a computer that better meet your needs.

here is an older example with a problem, that is resolved by user action as time progresses:

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Nope. Upgrades for current models are available at time of purchase only.