Yes. If you want to use signature fields in your fillable PDFs, please note that any signature fields must be added manually when preparing the fillable PDF. If the signature fields are automatically generated by your chosen software, they may not be interpreted as signature fields by third-party apps such as Procore.
Signature fields are supported on both iOS and Android mobile devices.
Note: When preparing a fillable PDF with Adobe Acrobat, leave the option 'This document requires signatures' unticked.