How to export photo with original metadata

[Sodapop]

Lightroom Version Number

Lightroom Classic

Operating System

1. Windows 10

Have a lot of photos I want to export with the original metadata. There is an exclamation mark with something about that but I do not understand it. Briefly, I want to change a large number of phots so that the exported ones will show the original date taken etc. I have the latest versions of Lightroom and windows 10. Please help

 

[Rob_Cullen]

This exclamation mark indicates that the file metadata in the Catalog is different to the file metadata on the hard-drive. Many people ignore this badge. It can show on image thumbnails if you use other apps outside of LrC to change the files in some way. (eg. do some keywording in Bridge)
But metadata like 'Date' 'Camera', etc. would not change unless you do that deliberately.
Now, when you Export from LrC- you can include [All Metadata] (from the Catalog record) in your exported files-

This is metadata from one raw image and its JPG export derivative (full-size) - Compare!