Can’t upload image via submitting custom post from frontend

The problem was here:

<input type="file" id="_themename-advert-create-image" name="_themename-advert-create-image" />

It should be:

<input type="file" id="_themename-advert-create-image" name="_themename-advert-create-image[]" />

Still can’t understand why I should add [] in my name, but now everything is working.

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