Here is the article https://experienceleague.adobe.com/docs/experience-manager-learn/forms/zipping-form-attachments/introduction.html you will need to make changes to the code to rename the attachments as per your requirements 

You will have to use custom code in your workflow to do thatsearxh for emailing attachments in AEM forms

https://experienceleaguecommunities.adobe.com/t5/adobe-livecycle-questions/copy-data-from-one-table-cell-to-another-table-cell-problem/m-p/300931 was this the solution that worked for you

You will need the windows based AEM forms designer previously known as livecycle designer

Also do you need to merge the data captured in adaptive form with the xdp template to generate the pdf?

there is nothing specific that needs to be done. Can you please send us the form?

You will have to write custom code to assemble the pdf files and show the pdf using a custom component the custom component to display the pdf is documented 

For core component based forms the following article for creating custom submit should workhttps://experienceleague.adobe.com/docs/experience-manager-learn/cloud-service/forms/custom-submit-headless-forms/custom-submit-service.html?lang=en 

deleted the following and then restarted. IT worked for me after this. Thank GODI fix it by deleting the following:crx-quickstart/repository/segmentstore/repo.lockcrx-quickstart/launchpad/felix/cache.lockcrx-quickstart/repository/indexcrx-quickstart/launchpad/config/org/apache/sling/jcr/repoini

https://experienceleague.adobe.com/docs/experience-manager-learn/forms/some-useful-integrations/geonames-org.html?lang=en