4 : Operation failed: 1

Question

So, I am able to access my victim's sdcard right now, but I want to create it persistent . So that when my victim's turns off his device I don't have to do all the hard work again to exploit the device. So I've created a bash file (syslogs.sh) and when I am trying to send it to my victim's device but an error pops up which looks like this -:
[-] 4 : Operation failed: 1
YOU CAN REFER THIS IMAGE HERE .
I tried adding backslashes because I read that on stackoverflow that adding backslashes removes the error but nothin happens in my case.
I AM USING MY PHONE FOR THE METASPLOIT I AM DOING IT THROUGH "TERMUX".

The thing is that I am not even able to upload a simple txt file to my victim's phone.. I have checked that "Install from unknown sources" is on. I can still exploit the victim's device but Iwant it to become persistent. As you can see here, My file is perfectly placed in my sdcard so I don't think that there is a problem with my placement of "syslogs.sh" file.
I would tremendously appreciate if someone helps or suggests me anything.!!
EDIT : I honestly do not intend to maliciously hack a phone or device I am merely trying to gain knowledge for my certification exam . Anyone is free to edit my wordings .