Hello again,

I will try share my experience on templates so for:

- Importing Template is working for me and can be enhanced IMHO by implementing features like Built-in fonts.

- What is not working is using templates to INVOICE from ESTIMATE. Never worked for me

- There are workarounds :
1- Use Android App to convert estimate to invoice, then use template (100% working) 

2- Copy converted invoice, and try to print using template (100% working with fix in Invoice #)

Anything suggesting Incognito Mode, Deleting Cache, Cookies, Using XYZ Browser...
is waste of time!

Thanks

Wajdy