WYSIWYG field problems

Hi,
I have a problem with the WYSIWYG field type.
I’m using SuiteCRM version 7.12.5.
I have already done the bypas to save an image taken for example from a screenshot and pasted in the field editor.
My problem is that not all images can be saved, especially the larger ones.
I think it’s a problem of data length.
In the database the field has TEXT type.
Any idea?
Thanks