There are several companies that offer electronic signing of documents. An example might be
Docusign, but there are others that offer a similar service. It is commonly used by large and small companies to manage agreements and contracts.
In June of 2020, in the middle of the big lockdown due to Covid, I was relocating from Northern Arizona to Michigan. Viewing the new house was out of the question and would have been expensive, because I lived several thousand miles away. So the house I was purchasing was "sight unseen". All we had available to see the house was a virtual video tour. Google gave me a good overview of the neighborhood and the surrounding areas. For that whole process, the wife and I used
Docusign many times to sign documents between my realtor (who was over 50 miles away), the realtor in Michigan (who was 2,000 miles away), the Bank in Michigan, the original owner (location unknown). This made the whole process much easier to manage.
It was interesting because many of the documents had multiple sections for Initials, and then a final signature. You could tab through the various sections that required your input. I believe the documents were in PDF format.
Docusign is a service that the company/person sourcing the documents must subscribe to. So it will cost you nothing to sign it.