I asked someone that has an iPhone and has posted pictures from same and the response I got was
"I start the usual way with clicking on “go advanced “, and then click the paper clip.
Click on Choose File.
Select Photo Library.
In the bottom left corner, click on Options, and then choose Medium.
Hit “Done”.
Select the picture you want and then click Done.
Upload and post as usual."
I don't know if the "Upload" button can be seen on an iPhone, but perhaps you will have to scroll over to the right
As Maria mentioned a lot of different companies made vibrating shuttle machines besides Singer. Some companies made machines and if other companies bought some they could put whatever name they wanted on the machines. The are called badged machines. I found a New Sterling made by National, then there is Sterling listed as a
Davis made a machine as well as
Standard.
If the instructions that I have given don't work, private message me and I will see if we can figure out another way to see your machine.