You have to configure the settings in respective configuration. Review Asset link sharing  for more details. Thanksthanks

Hope you have already reviewed AEM Development - Guidelines and Best Practices and Best Practices for Assets Performance​. Also there is lot of logical dependencies in code on path which is OOTB and should not be modified and something like this has never come into our picture. I am assuming if cust...

Hi,The versioning also works in Touch UI. review this for more detail - https://docs.adobe.com/docs/en/aem/6-3/author/assets/managing-assets-touch-ui.html#Asset VersioningIn fact all new updates and new additions are now in Touch-UI.Thanks,Gaurav

Add a custom property in default rail whose value will be checked and read-only by default and it query parameter would be assets which do not have expiry property.thanks

This does not seems to be related to AEM Assets as there is no such panel OOTB in AEM.Thanks

This is because that in AEM 6.3 DAM Update Asset workflow has been made transient. review more details here https://docs.adobe.com/docs/en/aem/6-3/develop/extending/workflows/best-practices.html#Transient Workflowsmake workflow untransient and trythanks

It depends on each organization policy. For example BFSI would never want to delete anything. You can review below for more understanding on AEM maintenance tasksAem maintenance Operations Dashboard Revision Cleanup Thanks,Gaurav

There is no such workflow OOTB. Could have been copied from DAM Update asset. You can check each workflow step and compare.Thanks,Gaurav

Should not be problem but you need to adjust references of path across wherever its used.Thanks

AEm supports PDF via some library and that library provides set of functionality. To edit PDF you need application which can understand format like to edit Video you need to have some app which understands video editing.Thanks