Slider and Banner image won't upload

[Preetikitty]

Hi there,

this is my very first store and I don't know what I'm doing wrong. 

I am using the default theme, and I changed the slider and banner image by uploading new images and it worked, but when I tried to change them again because I wasn't satidfied with how they looked, it keeps failing and i get the 'connection timed out' message.

Things I've tried:

- Resizing the image 
-changing the file name on the image, to something all lowercase and no numbers or spaces.

- refereshing the page over and over again. 

 

I hope someone can help, because i'm so frustrated and upset and I've been trying to google solutions for the last few days and I just can't seem to fix it or figure out what's wrong. Every other place I upload to and download from is fine. My host is iOnos if that helps. Thanks for your time.