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There's a virtual folder called webresources within each Microsoft Dataverse instance where you can request HTML, JS, CSS, image, and other files by name and access them in your browser. You can upload these files using the application or programmatically add them as Web resource table records. The XrmToolBox web resources manager is a community tool which can facilitate working with these records.
These records can refer to each other using relative path names in their content. This ability to upload files and request them by name provides all the building blocks you need to make web applications using files that are processed within the authenticated session of your browser. Using only client-side code with AJAX techniques, you can create rich applications that can run within a browser window or within an IFrame in a form or dashboard.
Most commonly, you'll use JavaScript web resources to add event handler functions to forms and commands.
More information:
Note
The maximum size of web resources is controlled with same setting that limits the size of email attachments. See the Maximum file size for attachments setting described in Manage email settings.
This value is set in the Organization.MaxUploadFileSize column. Learn how to read and update environment settings using code