to enable this feature into application\config\cms_config.php add:
$config['alt_enabled'] = TRUE;
After that you can edit links clicking on edit button for images, example:
Tag Archives: images
Change resolution on generated images
In template files code, images are dynamically generated this way, example with function _simg:
<img src="<?php echo _simg($file['url'], '470x311');?>"
How to add downloaded image to page content?
Usually images should be uploaded via gallery option in dashboard, if you really need to add image inside content then:
You should download wanted icons and upload it to image service
EDIT: postimg service is closed so use alternative like:
Some services like: https://imgur.com/ or https://imgbox.com/
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