To override path settings in [GraphFiles] and in configuration markers (see §42.2.9.4 Overriding graphic properties for HTML):
[Graphics]
; GraphPathOverrides = No (default) or Yes (overrides any path
; in Config markers and in [GraphFiles], adding GraphPath
; and using FixGraphSpaces)
GraphPathOverrides=Yes
When GraphPathOverrides=Yes, DITA2Go uses the path to graphics specified by GraphPath (see §32.1 Locating graphics files for HTML) instead of any path (or lack of a path) specified in [GraphFiles] (see §40.2.1.2 Substituting graphics files for HTML) or in a *Config PI marker that has content:
Also, DITA2Go replaces with underscores any spaces in file names of referenced graphics.
You can have DITA2Go eliminate spaces from the names of those original files, to make the names valid in all environments:
[Graphics]
; FixGraphSpaces = Yes (default, replace space with underscore) or No
FixGraphSpaces = Yes