1-The data on flightradar24 shows the location where the airplane's signal was lost, There's video evidence showing that the plane was heading back to the Airport:
https://www.tasnimnews.com/fa/news/1398/10/18/2177378/اولین-فیلم-از-لحظه-آتش-گرفتن-و-سقوط-هواپیمای-اوکراینی
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Another one:
These videos show that the airplane's engine was on fire and it was heading down to the ground, And both videos show the fire spreads and an explosion occurs right before the airplane hits the ground.
2-There are some investigations based on a video that shows a missile hitting the airplane:
The source of the video is this telegram channel:
https://****/PS752
This channel is created by a guy named Nariman Gharib.
This dude is one of the most furious anti-Islamic Republic figures of Iran's opposition, So the source of video is really biased, He is also a software developer and and IT expert, So technically he has the skills to temper with videos, Using software like Adobe After Effects. In that video, Someone is filming the black sky right before a missile hits a plane, Which doesn't make any sense, How he knew a missile is about to hit a plane in black sky in that location before it happened? And the guy who took the video is completely silent and doesn't give a reaction to a missile hitting a plane, Which i think is really reallly odd. NYT Geo-located where the video was taken, And it is near the last publicly know location of air plane, Based on data available on flightradar24.
So guys, I think Nariman told someone to go to that location in night and take a video of where plane's flight path supposed to be, Then used Trapcode Suite plugin in Adobe After Effects to add the misslie and the plane to the video.