Any document requiring an oath or affirmation must be signed in the presence of the Texas notary. A document requiring an acknowledgment of a signature may have been signed prior to the appearance of the signer before the Texas notary, but in order for the acknowledgment to be made, the signer must again appear before the notary to acknowledge that he or she signed the document. A Texas notary may not complete any notarial certificate without the appearance of the signer at the time the notarial act takes place and the certificate is completed.