To further personalize your forms, it is also possible to specify a custom icon that is displayed in Nintex Mobile. It is necessary that the icon is accessible by your SharePoint server for being transferred to Nintex Mobile. You can then specify the full URL in the Icon field.
The recommended dimensions is 150x150 pixels. This will scale down to the other sizes. Currently, only Nintex Mobile for Windows supports the display of icons for forms and tasks.
The name and description entered here will override the default values of the SharePoint form, and will be used instead by Nintex Mobile.
After more tips and tricks? > Mobile Apps - Personalize a task form for a business process
Thanks for the article.
I'm unable to add icons to my form - on publish, I get "Please provide a valid URL for Icon and make sure the file exists..."
Typing the URL into the browser returns the icon fine (https://sharepoint.mydomain.com/_layouts/NintexForms/Images/myicon.ico)
I have tried with an icon file and a png. Same result.
Using 1.5.2. Any ideas?