#13 — Change the required permission from 'Modify portal content' to 'Add portal content'

Right now the docs suggest you to use an action protected by the 'Modify portal content':

...
   <property name="permissions">
    <element value="Modify portal content"/>
   </property>
...

I'd recommend to update this to require the real permission, which is 'Add portal content'.

There's some cases where you can't edit the folder properties, but you're allowed to add content to it (for instance, when you grant the Contributor local role to someone).

This also requires a change in the browser/configure.zcml file:

...
    <!-- UPLOAD VIEW -->
    <browser:page
        for=".interfaces.IUploadingCapable"
        name="upload"
        class=".upload.UploadView"
        permission="cmf.AddPortalContent"/>

    <!-- UPLOAD FILE -->
    <browser:page
        for="*"
        name="upload_file"
        class=".upload.UploadFile"
        permission="cmf.AddPortalContent"/>

    <!-- UPLOAD JS INITIALIZATION -->
    <browser:page
        for="*"
        name="upload_initialize"
        class=".upload.UploadInitalize"
        permission="cmf.AddPortalContent"/>