: If the browser doesn't recognize AutoFirma, you may need to manually import the AutoFirma root certificate into your browser's "Authorities" list. Native Alternative

Move your digital certificate ( .p12 or .pfx file) from your folder to the Linux files folder in the Files app. Open AutoFirma from your launcher. Go to Tools > Settings > Signature .

Navigate to > Security > Manage certificates .

You need the specific version of AutoFirma built for Linux (Debian/Ubuntu).