Salesforce : Uploading Multiple Attachments

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Visualforce Code :
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<apex:page standardController="Account" extensions="MultipleAttchments">
    <apex:form >
        <apex:pageBlock title="Upload Multiple Attachments to Object">
            <apex:pageBlockButtons >
                <apex:commandButton value="upload" action="{!saveAttachments}"/>
            </apex:pageBlockButtons>
           
            <apex:pageMessages />
           
            <apex:pageBlocksection >
                <apex:pageBlockSectionItem >        
                    <apex:outputLabel value="Select Attachments you want to upload"/>
                    <apex:selectList value="{!selectCount}" size="1" multiselect="false"  onchange="changeCount()">
                        <apex:selectOption itemLabel="--None--" itemValue=""/>
                        <apex:selectOptions value="{!selectCountList}"/>
                    </apex:selectList>
                </apex:pageBlockSectionItem>
            </apex:pageBlocksection>
           
<!-- Section will appear when no. of attachments selected from drop down -->
            <apex:pageBlockSection title="Select Files" rendered="{!IF(selectCount!=null && selectCount != '', true, false)}">
                <apex:repeat value="{!allAttachments}" var="ATCH">
                    <Apex:inputFile value="{!ATCH.body}" filename="{!ATCH.Name}"/>
                </apex:repeat>
            </apex:pageBlockSection>
           
            <apex:actionFunction name="changeCount" action="{!changeCount}"/>
        </apex:pageBlock>
    </apex:form>
</apex:page>
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Controller
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public class MultipleAttchments {
   
    public list<SelectOption> selectCountList {get;set;}
    public String selectCount {get;set;}
    public list<Attachment> allAttachments {get; set;}
   
    public MultipleAttchments(ApexPages.StandardController controller) {
        selectCount = '';
        selectCountList = new list<SelectOption>();
        allAttachments = new list<Attachment>();
        for(integer i = 1; i < 11; i ++) {
            selectCountList.add(new SelectOption(''+i, ''+i));
        }
    }
   
    public PageReference saveAttachments() {
        String accId = system.CurrentPagereference().getParameters().get('id');
        if(accId == null || accId == '') {
            ApexPages.addMessage(new ApexPages.message(ApexPages.Severity.ERROR,'No Record is associated, Please pass the record Id in Parameter'));
            return null;
        }
        if(selectCount == null && selectCount == '') {
            ApexPages.addMessage(new ApexPages.message(ApexPages.Severity.ERROR,'Please select how many files you want to attach'));
            return null;
        }
        list<Attachment> insertList = new list<Attachment>();
        for(Attachment attach : allAttachments) {
            if(attach.name != '' && attach.body != null && attach.name != null) {
                insertList.add(new Attachment(parentId = accId, name = attach.name, body = attach.body));
            }
        }
        if(insertList.size() > 0 ) {
            insert insertList;
            ApexPages.addMessage(new ApexPages.message(ApexPages.Severity.INFO,'Attachment inserted successfully'));
        } else {
            ApexPages.addMessage(new ApexPages.message(ApexPages.Severity.WARNING,'Please select atleast one file to attach'));
        }
       
        return null;
    }
   
/*  Method will be called when number of attachments change on page */
    public PageReference changeCount() {
        allAttachments.clear();
        system.debug('==========='+ selectCount);
        for(integer i = 0; i < integer.valueOf(selectCount); i++) {
            allAttachments.add(new Attachment());
        }
        return null;
    }

}