I have some layers, and I would like to link the field photograph from the attributes table to an image (Web URL).
How can I do that? [Qgis 2.18 - Windows 10]
I finally found the answer
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1 - Create the attribute for the pictures (E.g. PICTURES Text(100)).
2 - Go to Fields in the proprieties of the layer and change the Edit widget (From Text edit to Web view).
3 - Now go to attribute tables. Put the layer in edit mode and insert the link or URL (for each row). Save it...
4 - Use the Identify Features and click above the feature.
I am not sure wether you should use "web view" or "photo" as field type.
In any case the URL should be indicated for each feature in your "Foto" field. You could also add a main one as the "Default value" (rather than constraint) in the "web view" or "photo" window.