I want to customize my document library edit and new form according to my client's need but I am unable to do so in SharePoint 2013 online.
Is it even possible to do so OOTB? I am just a beginner.
Please help me with this if possible.
My task is to validate all the fields and if found wrong entries, give alerts on the form itself.
Also provide divs/spans under fields, for example for 'NAME' field it should have one descriptive filed below it such as
Name should be in capital letters only.