j"19HxigV4QyBv3tHpQVcUEQyq1pzZVdoAutLÿTurns out you have to write some text in the square brackets before the round brackets where you put the URL:
![Slim volumes](https:/.....etc
Thanks for your help anyway.
Now working: https://www.bitpost.app/u/chblm/the-glory-days-of-dot-coms-25XPPRv
text/plaintext twetch_twtext_1627031095774.txt|"1PuQa7K62MiKCtssSLKy1kh56WWU7MtUR5SET twdata_jsonnullurlnullcommentnullmb_user1636reply@5a0a13e0dac039f2ae5736984d03311233bd316b56b2ae81a73a7b5a94b51714typepost timestampnullapptwetchinvoice$90affe40-988f-46d4-9b2c-8f37ba390704|"15PciHG22SNLQJXMoSUaWVi7WSqc7hCfva
BITCOIN_ECDSA"1GDKsvutqVXJQo1NUBofax7p4iB2kaMfW6LXIHhu6yXNHM2e3J0I1QUKI3x2BasQzIG+1ra7mdz4wxZwYl4Ue+mQVkZeY/SvvGEmCoQErnt3aN4t07TdAmvm2W0=
https://whatsonchain.com/tx/6ec393c30057976b6177e3716913f4bcce474991477346dc82502e755693f291