Ah... What the heck.. Let the flames begin..
If all you own is 2 chains ( for the saw, not the rapper, that's spelled with a "Z"). Well, I've got a suggestion..
Get a Stihl "2 in 1" sharpener.
You don't need to learn how to use it, as there is virtually a zero learning curve. Watch a short video on it.
It's main advantage is that you can't screw up, and that it sets the "rakers,", or if you prefer, the "depth gauges" at the same time.
If the saw is still throwing flakes after a tank of gas, fill the gas and bar oil, and go three strokes per tooth on the chain. You'll need more strokes if you hit something while cutting ( nail, etc,), or touched ground with the saw blade rotating.
Buy the right one as they are saw chain specific. You probably need a 3/8 or 3/8 P.. But, check before purchasing.
They sharpen well... Sharper than the best here could do by hand? Absolutely not! But, they get a chain at least as sharp as a new one.
https://www.amazon.ca/Stihl-Chainsaw-Chain-Sharpener-Replacement/dp/B077Y62715/ref=sr_1_12?crid=37RQ4YSM85B66&dib=eyJ2IjoiMSJ9.SOG-bGJ8GbVMWESiHWEUTS0231rVL5gNgKIRS7eMPmC_xGdT_oMsxdgOz8iju9QWPX0pzYPY7NPddoKOsWjptyjPaIxwERJumZwLd_1LiM52QGF6G0oiDKhJsGlB0Ngjay6F0zGM8zHrcH1ERfwWdemQyzYiHSFITVdJQYd45_h_f0z7KahdC36oLgANYU6IkI7ykXksfQeiTFZh-f7Y8rHrBvhIvsj5wfxgU_he6uP-bzmYdJqlIUaOmIonSsqq1QG84UV5YnhUgq3v5vSzZpPQztKLgtQW3qduIDZZagE.eU18v75n-1nAG5NlBSOu96lw0dzqqAuol56nAgs9Ojg&dib_tag=se&keywords=stihl+2+in+1+easy+file+chainsaw+chain+sharpener&qid=1722018729&sprefix=Stihl+2+in+,aps,127&sr=8-12
That listing is in Canadian Dollars, for a Branded Stihl product.. Knock offs are half the price.. or less.
No more wondering if it's sharp.. if it's not throwing flakes.. a few strokes is all it takes..