Flickr is an online photo management and sharing application.
Flickr does not allow you to include alternative text to your images. It is important to provide meaningful and descriptive text-based descriptions to accompany your image posts by using the “Add description” option.
Update Title Text
Flickr automatically inserts the file name as the photo's title (e.g. "Image123.jpg"). Be sure to update the title to a more descriptive text.