Guess I don’t need to say more?
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Make sure when adding images that the path name does not have spaces so if the filename has spaces you need to add %20 in the path name e.g.
'/src/assets/images/file name.png'
Would be;
'![file name alt txt](../../assets/images/file%20name.png)'
Easiest to rename files to all lowercase and replace spaces with dashes or underscores.
More info on astro site