The last I heard on the topic was December, Colin said they were building a signature component
I built a fixed version and put it in our marketplace located here
https://adalo.pragmaflowservers.com/install-component
However that has been offline since January 7th and we are waiting on Adalo to send us some documents to bring it back online. Once it is online you can use the signature component from our marketplace and it will fix your issue on Safari and Native.