Tip:
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Login into WordPress Dashboard
Goto 'Posts' section
Create 'new post' or open 'existing post'
In post editor, click 'Add Media' button
On 'Insert Media' page, click 'Upload Files' button
Click 'Select Files' button to select and upload image stored on your computer
Once image is uploaded, configure properties
Add revelant title, caption, alt text, description to image
Then select required Image Display Settings
Select Image alignment, we select Center
Select Image link property, we select original image
Select Image size, we select medium size
Then click 'insert into post' button
Uploade image will display in the Post editor
Click 'Update' button save changes
Click 'Preview Changes' button to see post with image
A medium size Image will appear center align in Post