Share your form at vkatoch07@gmail.com, I'll have a look.   One approach is bind the image fields with the images you want and then show/hide the image fields based on your conditions.

So my question is there should be some condition on which you need to hide the logo on some pages. Can you please apply that condition on the footer in the javascript code?

Saving each individual pdf per record in the xml data is possible through AEM forms output service, you will not achieve this with AEM designer.

Go through this, its very simple https://help.adobe.com/en_US/livecycle/10.0/DesignerHelp/WS107c29ade9134a2c136ae6f212a1f379c94-8000.html  

Check this if it help: https://help.adobe.com/en_US/AEMForms/6.1/DesignerHelp/WS92d06802c76abadb-728f46ac129b395660c-7f83.2.html#:~:text=high%20resolution%20output.-,Select%20File%20%3E%20Form%20Properties.,Document%20And%20Its%20Security%20Settings.  

Tou need to make the field expand to fit in the layout tab.   scribble signature feature not available in pdf form yet i think, in pdf digital signature used

Write the below script to reset the subform data.   xfa.host.resetData("somExpression of your subform will come here");   eg.:  xfa.host.resetData("xfa.form.form1.testVk");   testVk is my subform name here and form1 is my page name

Can you please provide more details on this? What code you have written and on what condition you are adding two fields? If possible share your form and detailed scenario.   As per the above detail, you need to check the value of field on which addition is applied.   if(sameItem is true or whatever ...

Refer below: https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager-forms/designer-uninstall-issue/td-p/422526

The below script will give you the desired data. var yourFieldValue = yourField.rawValue;var convertedValue = yourFieldValue.toString().substr(-1);