> Do you have videos showing cattle, warehouses, trucks etc.?
No. And I surely agree with you that the explanations are probably broad generalizations. I have no idea how those that do it earn money in any specific case, but deforestation is really happening across the globe and definitely in Amazon forests too.
https://www.climatecentral.org/gallery/maps/amazon_deforesta...
Here is one description:
https://earthobservatory.nasa.gov/world-of-change/Deforestat...
"This pattern follows one of the most common deforestation trajectories in the Amazon. Legal and illegal roads penetrate a remote part of the forest, and small farmers migrate to the area. They claim land along the road and clear some of it for crops. Within a few years, heavy rains and erosion deplete the soil, and crop yields fall. Farmers then convert the degraded land to cattle pasture, and clear more forest for crops. Eventually the small land holders, having cleared much of their land, sell it or abandon it to large cattle holders, who consolidate the plots into large areas of pasture."
As the name of the area depicted is stated in this case: "The state of Rondônia in western Brazil — once home to 208,000 square kilometers of forest (about 51.4 million acres), an area slightly smaller than the state of Kansas — has become one of the most deforested parts of the Amazon" you can do your own research starting from there.
Also:
https://www.theguardian.com/global-development-professionals...
"The Amazon rainforest is the world’s largest, but in the last 40 years at least 20% of it has been destroyed. The Amazon basin covers nine countries in South America, with 60% of it in Brazil, and for a decade local photographer Rodrigo Baleia has documented the beauty and destruction of the region from above"