Mr Graham said there was nothing on his iPhone 13 which would link him to the felling, adding: "I've got no worries about anything on that phone, nothing at all."
When asked in a later interview about the video found on his phone, Mr Graham repeatedly replied "no comment", the court heard.
In among his refusals to answer questions, he did tell officers: "That might be my phone, that doesn't mean I was stood behind it."
After watching the video, Mr Graham also said: "From the sound, I guarantee whichever [chainsaw] you've got from mine, not one of them will sound like this."
He later told officers he did know who had cut down the tree but would not be a "grass" and ruin the lives of someone's kids, adding it was a "shock but not a surprise" the tree was felled and: "If I get the blame, I get the blame, I will deal with it."
Asked if he knew how to fell trees, Mr Graham said he could do small and medium ones and directed police to look at his Facebook page to see what work he had done.
"I've never done a large fell," he said, adding he had done "pretty high trees" but "nothing with major diameter".
Mr Graham was asked how he would cut down a large tree, to which he replied he would cut a notch in the front to mark the direction of fall then chop a wedge out the back, which jurors have heard is the "hinge-and-wedge" technique used to fell the sycamore.
He also said he left the keys in all his vehicles, including his Range Rover, and they were free for anyone to use.
In his interview, Mr Carruthers, who worked in property maintenance and as a mechanic, also said he was not responsible for felling the tree.
He said he had received no training in how to operate a chainsaw but had used them, adding they were "nasty things" and he would "stick with spanners".
Mr Carruthers said he would "have a go" at chopping down a tree if asked, but it would not be a "pretty job" and he could not recall ever cutting one down.
He also said he could not remember his movements at the time of the felling, as his partner had just had a child and he was "exhausted".
The trial continues.
