Hello
1) What size must be the photos of the articles in campaign and blog category?
2) Will I be able to add a video or gif (instead of a photo), as main preview for an article?
3) Will I be able to post more photos (except the main photo), videos or links inside the articles?
Do you mean articles on Blog page here?
1 - Let's take the first article as sample: https://ja-donate.demo.joomlart.com/images/joomlart/blog/item-2.jpg
2 - The intro image should be added via Images tab here: https://prnt.sc/r3e1mm I'm afraid that it supports photo only
3 - Yes, in the main content of article, you can add video / photo as you wish.
1) 900x675. Not bigger for better quality?
2) If the intro image can be uploaded separated, I can make the size smaller. Right?
The intro text will be used in category blog view, featured view so yes, you can use smaller size.
Thank you
