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Someone more expert than me will have to confirm this but I am pretty sure wikitree is not one of the sites supported by SmartCopy.

You cannot upload a Gedcom on Geni, You can use SmartCopy (https://www.geni.com/projects/SmartCopy/18783) to copy data from a number of other sites to Geni a page at a time. The reason is that Geni is a site to collaborate on building one Word tree and importing a Gedcom would create many duplicates. Importing one page you can solve any data conflicts and merge duplicates for that page before going to the next page.
There is a good chance that many profiles from your Gedcom will be already in Geni (the further back in time the greater the chance), so you would not have to add too many profiles.

For this, you do not need a pro account.

Important: On Geni when you connect to the Word tree there is no tree that you can call "my tree" the first few generations can be private, but the further back in time you go the more managers a profile will have. Because of this, there are some guidelines for how to use the name fields (that get more important if a profile has multiple managers). Those guidelines will make it easier to avoid adding duplicate profiles.

When you have data on Geni, you can do a Gedcom export, but this is limited to some 5000 profiles.

Wikitree is able to be imported using smartcopy but there are some fields that do not copy across, I think the mothers maiden name is one such field from memory.

Wikitree works fine with SmartCopy. There might be difficulty in parsing maiden names when the Wikitree profile goes nuts with .. AKA and formerly and additionally ... Names for women married several times.

You need to request full access to SmartCopy by writing a line in this forum: "https://www.geni.com/discussions/147619 (Which I now see you already did.)

Yesterday SmartCopy had some access problems. Perhaps that caused your question.

It is a great tool but should be use with care. Be cautious when editing or merging already existing profiles, or avoid that. Especially if the already existing profile provides some details or citations in the "About" field, or it has many managers, or it is a middle age profile - since medieval trees often are speculative and contradictory.

It is recommeneded to uncheck the "Detect geolocation and populate fields" option in the SmartCopy configuration . It may guess wrong country and region. At least if the profiles you copy lived outside the U.S., and the addresses do not state the country.
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There are two "entry points" to WikiTree ... a MyHeritage "SmartMatch(TM)" to WikiTree, and the direct WikiTree site.

The MH SmartMatch may not always "get to" the information with SmartCopy; I often have SmartCopy "hang" while parsing. So I then click the link through to the "source" WikiTree page, and then SmartCopy will parse it.

However, currently SmartCopy doesn't figure out the relationships well (except spouses and siblings), so one has to explicitly define the relationships for each parent or child profile. (I haven't yet looked into why SmartCopy isn't able to "figure out" those relationships directly on the WikiTree site.)

re: locations ... in all cases, the locations should be examined. Letting Google (via the API) look up the locations can be very useful, particularly since you can often give it a bit of an "assist" (e.g.: by adding commas, or by adding " Co.," to a county name, or adding the country such as changing "VA" to "VA,US" to prevent it being interpreted as Vatican City in Rome).