If you are seeing the POWr shortcode but not the actual App when viewing your Tumblr blog on a mobile device, you are most likely using a Tumblr mobile theme.
Custom code in your website head is not being transferred over to your mobile theme. Therefore, no POWr script is being loaded and the app won't appear. The Tumblr mobile theme is enabled by default.
There are two possible solutions for making the app appear on the mobile version of your Tumblr blog:
- Switch off the default mobile theme by logging in to your Tumblr account and going to Edit Theme > Advanced Options.
- Uncheck Use Default Mobile Theme to turn off the mobile theme.
- Customize your mobile theme and add the POWr script to your custom theme. You can use the instructions from this article to do this.