It might also be that the file path is pointing to a wrong path. Upload a new image through the live app and if it displays appropriately then the image link in the database is pointing to a different place.
You need to make sure https://ctech.digital points directly to your project public folder.
So when I visit https://ctech.digital the content of the public folder should be loaded.
what I do in some cases where I want to use the main domain is:
rename the project public folder to public_html, and then move my project folder to one folder below in such a way the content on the renamed public folder stays on the web root (public_html). But if you are using subdomain it is easier since you can choose what folder you want the subdomain to point to.