scratch 6.1 installation worked without any problem. Can you try updating on any other instance and check if you face the same issue there aswell. Just to make sure its consistant and an issue on the upgrade !

Please log a support ticket to debug this further.https://daycare.day.com/home/createaticket.html

see if there is any JS error when you change to preview mode

As @edubey mentioned, Use Capital letter for the first letter of jcr:title

Touch UI doesnt support crop feature in dialog, alternate approach you can use is to crop the image from the DAM itself and then upload the right image https://docs.adobe.com/docs/en/aem/6-0/author/assets/managing-assets-touch-ui.html

When you reply, there is a 'Choose Files' button to attach

OOB, thats how the renditions of an image are stored.

that should be working !Please make sure the required JQuery version is available. It looks like, the JQuery version which is available doesnt support one of the function used in your dialog.

Component Dialog would be created to use in 'Author' instance only. Only the content will be able to access in Publish instance.How are you accessing it in publish instance !!

Yes... Use this pattern to set the time aswellyyyy-MM-dd-HH-mm