@davidlist87 Your file content is not base64 encoded. Where you are specifying the file content, use an expression like base64(body('whatever')?['File_Content']) where whatever is the name of the action where you got that file content from dropbox.
Write base64() in the expression builder, click between the brackets then switch to the dynamic content tab and find the File Content.
@WillPage thanks for your help but it seams to be throwing an input error.
My expression is: base64(body('When a file is modified')?['triggerBody()'])
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