As part of a course I gave last week on using online family trees (notes in process of being shifted to here), I had a play with WikiTree.
It's a collaborative tree, so you can really only do one automatic gedcom upload, preferably only for a small manageable section of your tree that you're prepared to monitor and merge in duplicates when you find rellies also working there that you can collaborate with.
Thereafter maintenance should be manual. Read their help files.
This is an experiment with their embeddable widgets, which update when the base data they come from is updated.