Multiple filenames in Entity form notification mail
[UPDATED] Your Rule will need to have some additional actions preceding the Send Mail action.


Add variable (Text). Let's call it - [file_list]
Add Loop that loops over your file field [entity:field-uppladdarfaltet] and produces a List Item. Lets call the list item variable [file_n]
Add action Add Variable (text). Call it [file_item]
Add action Set a Data Value. Data to change will be [file_item]. Value to set will be [file-n:file:name]
Add action Set a Data Value. Data to change will be [file_list]. Value to set will be [file-list:value][file-item:value]&lt;br&gt;. This will add each uploaded file's name to the list with a line break after the name.
Print variable [file_list:value] in the email body.


Here's screenshot: