It is certainly a bug. As suggested in other posts I've tried to make this change and I solved the problem:

You should replace the div marked by class journal_localFileShare (<div class="journal_localFileShare">) and replace the wrong fragment with this fragment:

<div class="journal_localFileShare">

	<span class="browser-upload-btn"><%= LocalizeString("UploadFromLocal.Text") %></span>

	<span class="dnnInputFileWrapper">

		<input id="uploadFileId" type="file" name="files[]">

	</span>

	<div>

		<a href=" void(0)" id="LocaleFile" class="dnnSecondaryAction"><%= LocalizeString("UploadFromLocal.Text") %></a>

	</div>

</div> 

You also should add this simple Javascript function anywhere within a block of client-side script:

    
$('#LocaleFile').on('click', function(e){$('#uploadFileId').click();});

Now everything works fine, I hope it can help you too.