Thank you for contacting us.
Currently, there is no way to set a global maximum for images being uploaded. To achieve that you would need to create a custom DataProvider, which serves as an intermediary between programmatic CRUD operations and the database.
Basically, you need to create a new provider and inherit from the default LibrariesDataProvider. Then you can override the UploadImage method to include your custom logic. Make sure to set the ResizeOnUpload property to false such as:
LDPC : OpenAccessLibrariesProvider
UploadImage(Telerik.Sitefinity.Libraries.Model.Image image, System.IO.Stream source,
//custom resize logic ...
.UploadImage(image, source, mimeType);
For more information on how to substitute the default libraries provider with your custom one once you've implemented and built the class you can check this blog post
, I hope you find it useful.
All the best,
the Telerik team
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