Import load file fails consistently due to size limit.

Problem

Users cannot upload exhibits larger than 4MB (Upload fails)

Resolution

2. Change the line 

<httpRuntime requestValidationMode="2.0" />  (should be line 162)

To: 

<httpRuntime requestValidationMode="2.0" maxRequestLength="256000" />

(**note, the maxRequestLength takes values in KB.  The value above sets it to 250MB)

3. Save web.config, then perform an iisreset on the web server.

Cause

Default web request length max size is 4MB.  Reported in Summation 5.0.0, fixed in subsequent releases.