Wordpress Blog Content Upload

Hello Friends,
I want to confirm if there is a way I can upload many content in text format to different blog category at once.

I am also interested to know this.

Kindly add some details. Do you mean uploading from email or some third party uploaders?

Because you can do this by just specifying more than one blog category on the right-hand panel on WordPress, and on email uploaders, you just need to select the categories on the subject of the email. Third-party uploaders have their own category drop-down list that you feed yourself

Something like this should work: https://mainwp.com/extension/article-uploader/