Set Window Size in Project settings to match your layout.
If there is any created one you can use trigger 'On created' combined with system > 'Pick all object' (if necessary) then set text to Sprite.Count.
Compare two values;
Sprite.count equal to 0 --> set text to "Object not exist"
Try picking tile by using 'pick nearest' to touch coordinate then move the cursor there.
Or check following isometric cursor tutorial & example: construct.net/en/tutorials/isometric-mouse-calculation-744
You can use my example: dropbox.com/s/p2p9h1b2ite63bq/tomb_miner.capx
Do research and make comparison to other game engine for example Godot since the editor is a game itself.
Use boolean instead of trigger once. So the logic is when a boolean switched state the action won't executed further more.
Create instance variable first and rename it.
Yes it is but add AJAX first to retrieve string from imported txt file.
Upload the project file to file sharing cloud such as dropbox, google drive, one drive or similar then share the link with given access here.
An example got A* implemented: dropbox.com/s/ibrle5bdb4rhmfy/path_touch.capx
Check in layer properties whether it set to "Force own texture" or transparency unchecked.
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Not straight answer but this example hopefully gives you an idea about hex grid spacing & picking: dropbox.com/s/7e1s4vl9vh6bion/hex_presentation.capx
Make sure pinning executed once. If you are using boolean as condition, verify the boolean toggled state to false after pinning.
Mostly problem with image point position. How big the sprite is?