Are you sure PayPal supports BTC and other crypto? Because I can't find a crypto option or wallet on my PayPal account, it only supports local currency. Or is PayPal BTC not supported in my country yet?
Anyway, I think it's not a good idea to use PayPal to buy something online and settle it with BTC using PayPal. You don't have full control of your wallet; it's still good if you have a non-custodial wallet.
I remember forum members tested with Paypal when it accepted Bitcoin years ago but randomly I found this interesting service. CoinPal beta - Buying bitcoins with PayPal. It's since 2010 and while it is not related to Bitcoin accepted by Paypal, it's still interesting history of Bitcoin adoption.