Does File Manager on Yola have issues at times?

I need to know if Yola does not always save correctly in File Manager. I have tried repeatedly to upload a file to replace an old one that is too big. The old one is 160 kb and new one is 82.5 kb. In the image editor it shows it is 82.5 kb and when I do the mouseover to upload to file-manager in Yola it says 82.5 kb. But, when it says do I want to overwrite the old file and I say yes, it still loads up as the old 160 kb file? Has this happened to anyone else and if so, what can I do to remedy it? If not, then I can only assume it is my internet connection somehow? Thank you much, denise:) PS I am using Firefox browser and also, uploading only one file, 82.5 kb's.