You really need to concentrate on the image size. Look at Image/Image Size. Best to use image size in pixels of height and width. Uncheck resample image and change one variable and see what happens. THen check resample image and see what happens. The resolution is also a variable.
So bottom line you only need to send a hi res image and state how large you want it printed. Do a web search for print size vs image size to see what resolution needs to be.
Most likely you increased the pixel count too high which inflated the file size required. An image that large is not viewed up close so you do not need to print it at a high resilution like 300Dpi. Pring an image that size at 100Dpi will be fine.
196cm x 143cm at 300dpi is 23150px by 16890px = 391,003,500px 391Mpixels
196cm x 143cm at 200dpi is 15433px by 11260px = 173,775,580px 174Mpixels
196cm x 143cm at 100dpi is 7717px by 5630px = 43,446,710px 43Mpixels
Your camera pixels are most likely nearer to 43Mpixels then to 391Mpixel intepolation can do just so much adding that many pixels will only produce a soft image anyway IMO