Description: When trying to add signature using Insert > Signature Line to a pdf in LO-Draw, signature is not getting saved and not visible when opened in some pdf reader. Steps to Reproduce: 1.Open an existing pdf in LO Draw. 2.Then insert a signature by Insert -> Signature Line 3.Select some rectangular region in chosen pdf.This is where you want to add sign. 4.Select a certificate to sign and click on Finish Signing in Info-Bar. Actual Results: It is expected that a signature will be added when clicked on Finish Signing in Info-Bar and signature will be visible when opened in some pdf reader(e.g Adobe reader,WPS-Office). Expected Results: When clicked on Finish Signing in Info-Bar signature is not getting saved.And it is also not visible when opened in some pdf reader. Reproducible: Always User Profile Reset: Yes Additional Info: Version: 7.5.1.2 (X86_64) / LibreOffice Community Build ID: fcbaee479e84c6cd81291587d2ee68cba099e129 CPU threads: 8; OS: Windows 10.0 Build 22621; UI render: Skia/Vulkan; VCL: win Locale: en-IN (en_IN); UI: en-US Calc: CL threaded