uploading a signed PDF to DC removes certificates and replaces them

hello,

every time I send a PDF previously signed by a certificate (not just via adobe acrobat, some other tool) to the document cloud (so, for example I send it into the signing flow) the already existing certificates get removed and they're replaced by Adobe's own certificate, making them usless in the procedure. any way to keep the existing certificates intact?

thanks in advance for your help!

cheers,

Paweł