When I search data from catalogue and 'Add to Current Map', error shows- "One or more items failed to add. Please see the notifications pane for more information."
Why did this occur? Though I established folder connection.
If you add one layer at a time (instead of all 7 at the same time) do you still get the error? This could help determine if the problem is associated with one or with all the layers.
I also noticed the catalog pane says “indexing still in progress” next to the “search results” text. This message may point to the actual root of the problem.
"indexing is still in progress"
is the notification that is given in your image.
Did it complete?
Can you add just one of the images when the notification goes away?
What are the sources of the data? locally stored?
more details might help