I want to upload 2000x6000px pictures (site jpeg mockups i made) - i get memory errors (The thumbnail creator i believe make this errors). My host company dont give me accses to ini.php (increase memory)

Any way this is very long jpegs i dont want thumbnails for this set of pictures?

And/or sometimes i need thumbnail only for one set of pics (Portfolio page 500X500 thumbnail and thats it! i dont need this thumbs for blog pictures and sliders) - someone know about some Github issue about this problem? (some checkbox for "create by deafult" or "ask me before you make this thumbnail")