Some ad-servers allow 3rd party calls when a design is being loaded (a call to a file on another server) and some do not. do not allow most 3rd party calls.

In Flexitive, you can choose from over 900 web fonts from Google Fonts. In addition to the default Google Fonts, you can also upload a custom font to Flexitive

When a design that contains a web font is viewed, the web font is loaded from either the Google Fonts servers if it's a Google font, or the Flexitive servers if it's a custom font. The call to the server to load the font is a 3rd party call. allow 3rd party calls to Google servers but do not allow for 3rd party call to Flexitive's servers, so when creating a design to serve through containing a custom font, you will want to use one of the following best practices:

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