Upload Wizard returns:
Internal error: Server failed to store temporary file.
Tried twice

Try out this from BatchUploadTools:

uploader.py

def upload_single_file(file_name, media_file, text, target_site,
                       chunk_size=5, chunked=True, overwrite_page_exists=False,
                       upload_if_duplicate=False, upload_if_badprefix=False,
                       ignore_all_warnings=False):

With chunked=False

Open the file in GIMP to convert it and try manual uploading:
(see warnings)

Should we rename it to Utgrävningar_i_Teotihuacan_(1932)_-_SMVK_-_0307.g.0108.tif for consistency?

Yes. Modified the source-field to document the modifications and requested renaming

Renamed and comment added to source field instead

I don't follow. The comment about the modification was in the source field in my first edit. I don't see a difference when diffing your last with mine. Are you referring to some other comment I should know of?

In T154578#2975711, @Mattias_Ostmar-WMSE wrote:

I don't follow. The comment about the modification was in the source field in my first edit. I don't see a difference when diffing your last with mine. Are you referring to some other comment I should know of?

I was referring to your edit :) just mentioned it here to clarify what had happened in response to the comment